|  | library; | 
|  | // | 
|  | // Problems in library: | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:114:22: Error: A value of type 'Object?' can't be assigned to a variable of type 'Object'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   Object objectVar = objectNullableArg; | 
|  | //                      ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:115:15: Error: A value of type 'num?' can't be assigned to a variable of type 'Object'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   objectVar = numNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:116:15: Error: A value of type 'int?' can't be assigned to a variable of type 'Object'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   objectVar = intNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:117:15: Error: A value of type 'double?' can't be assigned to a variable of type 'Object'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   objectVar = doubleNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:118:15: Error: A value of type 'Function?' can't be assigned to a variable of type 'Object'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   objectVar = functionNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:119:15: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'Object'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   objectVar = toVoidNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:120:15: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'Object'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   objectVar = tearoffableNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:121:15: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'Object'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   objectVar = xNonNullNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:122:15: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'Object'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   objectVar = xPotentiallyNullArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:123:15: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'Object'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   objectVar = xPotentiallyNullNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:124:15: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'Object'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   objectVar = yNonNullNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:125:15: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'Object'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   objectVar = yPotentiallyNullArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:126:15: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'Object'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   objectVar = yPotentiallyNullNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:128:16: Error: A value of type 'Object' can't be assigned to a variable of type 'num'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   num numVar = objectArg; | 
|  | //                ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:129:12: Error: A value of type 'Object?' can't be assigned to a variable of type 'num'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   numVar = objectNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:130:12: Error: A value of type 'num?' can't be assigned to a variable of type 'num'. | 
|  | //   numVar = numNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:131:12: Error: A value of type 'int?' can't be assigned to a variable of type 'num'. | 
|  | //   numVar = intNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:132:12: Error: A value of type 'double?' can't be assigned to a variable of type 'num'. | 
|  | //   numVar = doubleNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:133:12: Error: A value of type 'Function' can't be assigned to a variable of type 'num'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   numVar = functionArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:134:12: Error: A value of type 'Function?' can't be assigned to a variable of type 'num'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   numVar = functionNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:135:12: Error: A value of type 'void Function()' can't be assigned to a variable of type 'num'. | 
|  | //   numVar = toVoidArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:136:12: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'num'. | 
|  | //   numVar = toVoidNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:137:12: Error: A value of type 'Tearoffable' can't be assigned to a variable of type 'num'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   numVar = tearoffableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:138:12: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'num'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   numVar = tearoffableNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:139:12: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'num'. | 
|  | //   numVar = xNonNullArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:140:12: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'num'. | 
|  | //   numVar = xNonNullNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:141:12: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'num'. | 
|  | //   numVar = xPotentiallyNullArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:142:12: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'num'. | 
|  | //   numVar = xPotentiallyNullNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:143:12: Error: A value of type 'YnonNull' can't be assigned to a variable of type 'num'. | 
|  | //   numVar = yNonNullArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:144:12: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'num'. | 
|  | //   numVar = yNonNullNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:145:12: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'num'. | 
|  | //   numVar = yPotentiallyNullArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:146:12: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'num'. | 
|  | //   numVar = yPotentiallyNullNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:148:16: Error: A value of type 'Object' can't be assigned to a variable of type 'int'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   int intVar = objectArg; | 
|  | //                ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:149:12: Error: A value of type 'Object?' can't be assigned to a variable of type 'int'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   intVar = objectNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:150:12: Error: A value of type 'num' can't be assigned to a variable of type 'int'. | 
|  | //   intVar = numArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:151:12: Error: A value of type 'num?' can't be assigned to a variable of type 'int'. | 
|  | //   intVar = numNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:152:12: Error: A value of type 'int?' can't be assigned to a variable of type 'int'. | 
|  | //   intVar = intNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:153:12: Error: A value of type 'double' can't be assigned to a variable of type 'int'. | 
|  | //   intVar = doubleArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:154:12: Error: A value of type 'double?' can't be assigned to a variable of type 'int'. | 
|  | //   intVar = doubleNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:155:12: Error: A value of type 'Function' can't be assigned to a variable of type 'int'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   intVar = functionArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:156:12: Error: A value of type 'Function?' can't be assigned to a variable of type 'int'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   intVar = functionNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:157:12: Error: A value of type 'void Function()' can't be assigned to a variable of type 'int'. | 
|  | //   intVar = toVoidArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:158:12: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'int'. | 
|  | //   intVar = toVoidNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:159:12: Error: A value of type 'Tearoffable' can't be assigned to a variable of type 'int'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   intVar = tearoffableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:160:12: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'int'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   intVar = tearoffableNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:161:12: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'int'. | 
|  | //   intVar = xNonNullArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:162:12: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'int'. | 
|  | //   intVar = xNonNullNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:163:12: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'int'. | 
|  | //   intVar = xPotentiallyNullArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:164:12: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'int'. | 
|  | //   intVar = xPotentiallyNullNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:165:12: Error: A value of type 'YnonNull' can't be assigned to a variable of type 'int'. | 
|  | //   intVar = yNonNullArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:166:12: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'int'. | 
|  | //   intVar = yNonNullNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:167:12: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'int'. | 
|  | //   intVar = yPotentiallyNullArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:168:12: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'int'. | 
|  | //   intVar = yPotentiallyNullNullableArg; | 
|  | //            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:170:22: Error: A value of type 'Object' can't be assigned to a variable of type 'double'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   double doubleVar = objectArg; | 
|  | //                      ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:171:15: Error: A value of type 'Object?' can't be assigned to a variable of type 'double'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   doubleVar = objectNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:172:15: Error: A value of type 'num' can't be assigned to a variable of type 'double'. | 
|  | //   doubleVar = numArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:173:15: Error: A value of type 'num?' can't be assigned to a variable of type 'double'. | 
|  | //   doubleVar = numNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:174:15: Error: A value of type 'int' can't be assigned to a variable of type 'double'. | 
|  | //   doubleVar = intArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:175:15: Error: A value of type 'int?' can't be assigned to a variable of type 'double'. | 
|  | //   doubleVar = intNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:176:15: Error: A value of type 'double?' can't be assigned to a variable of type 'double'. | 
|  | //   doubleVar = doubleNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:177:15: Error: A value of type 'Function' can't be assigned to a variable of type 'double'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   doubleVar = functionArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:178:15: Error: A value of type 'Function?' can't be assigned to a variable of type 'double'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   doubleVar = functionNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:179:15: Error: A value of type 'void Function()' can't be assigned to a variable of type 'double'. | 
|  | //   doubleVar = toVoidArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:180:15: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'double'. | 
|  | //   doubleVar = toVoidNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:181:15: Error: A value of type 'Tearoffable' can't be assigned to a variable of type 'double'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   doubleVar = tearoffableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:182:15: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'double'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   doubleVar = tearoffableNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:183:15: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'double'. | 
|  | //   doubleVar = xNonNullArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:184:15: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'double'. | 
|  | //   doubleVar = xNonNullNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:185:15: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'double'. | 
|  | //   doubleVar = xPotentiallyNullArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:186:15: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'double'. | 
|  | //   doubleVar = xPotentiallyNullNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:187:15: Error: A value of type 'YnonNull' can't be assigned to a variable of type 'double'. | 
|  | //   doubleVar = yNonNullArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:188:15: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'double'. | 
|  | //   doubleVar = yNonNullNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:189:15: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'double'. | 
|  | //   doubleVar = yPotentiallyNullArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:190:15: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'double'. | 
|  | //   doubleVar = yPotentiallyNullNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:192:26: Error: A value of type 'Object' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   Function functionVar = objectArg; | 
|  | //                          ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:193:17: Error: A value of type 'Object?' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = objectNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:194:17: Error: A value of type 'num' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = numArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:195:17: Error: A value of type 'num?' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = numNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:196:17: Error: A value of type 'int' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = intArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:197:17: Error: A value of type 'int?' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = intNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:198:17: Error: A value of type 'double' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = doubleArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:199:17: Error: A value of type 'double?' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = doubleNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:200:17: Error: A value of type 'Function?' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = functionNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:201:17: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = toVoidNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:202:17: Error: Can't tear off method 'call' from a potentially null value. | 
|  | //   functionVar = tearoffableNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:203:17: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = xNonNullArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:204:17: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = xNonNullNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:205:17: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = xPotentiallyNullArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:206:17: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = xPotentiallyNullNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:207:17: Error: A value of type 'YnonNull' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = yNonNullArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:208:17: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = yNonNullNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:209:17: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = yPotentiallyNullArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:210:17: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'Function'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   functionVar = yPotentiallyNullNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:212:31: Error: A value of type 'Object' can't be assigned to a variable of type 'void Function()'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   void Function() toVoidVar = objectArg; | 
|  | //                               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:213:15: Error: A value of type 'Object?' can't be assigned to a variable of type 'void Function()'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   toVoidVar = objectNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:214:15: Error: A value of type 'num' can't be assigned to a variable of type 'void Function()'. | 
|  | //   toVoidVar = numArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:215:15: Error: A value of type 'num?' can't be assigned to a variable of type 'void Function()'. | 
|  | //   toVoidVar = numNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:216:15: Error: A value of type 'int' can't be assigned to a variable of type 'void Function()'. | 
|  | //   toVoidVar = intArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:217:15: Error: A value of type 'int?' can't be assigned to a variable of type 'void Function()'. | 
|  | //   toVoidVar = intNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:218:15: Error: A value of type 'double' can't be assigned to a variable of type 'void Function()'. | 
|  | //   toVoidVar = doubleArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:219:15: Error: A value of type 'double?' can't be assigned to a variable of type 'void Function()'. | 
|  | //   toVoidVar = doubleNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:220:15: Error: A value of type 'Function' can't be assigned to a variable of type 'void Function()'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   toVoidVar = functionArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:221:15: Error: A value of type 'Function?' can't be assigned to a variable of type 'void Function()'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   toVoidVar = functionNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:222:15: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'void Function()'. | 
|  | //   toVoidVar = toVoidNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:223:15: Error: Can't tear off method 'call' from a potentially null value. | 
|  | //   toVoidVar = tearoffableNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:224:15: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'void Function()'. | 
|  | //   toVoidVar = xNonNullArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:225:15: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'void Function()'. | 
|  | //   toVoidVar = xNonNullNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:226:15: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'void Function()'. | 
|  | //   toVoidVar = xPotentiallyNullArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:227:15: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'void Function()'. | 
|  | //   toVoidVar = xPotentiallyNullNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:228:15: Error: A value of type 'YnonNull' can't be assigned to a variable of type 'void Function()'. | 
|  | //   toVoidVar = yNonNullArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:229:15: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'void Function()'. | 
|  | //   toVoidVar = yNonNullNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:230:15: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'void Function()'. | 
|  | //   toVoidVar = yPotentiallyNullArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:231:15: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'void Function()'. | 
|  | //   toVoidVar = yPotentiallyNullNullableArg; | 
|  | //               ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:233:32: Error: A value of type 'Object' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   Tearoffable tearoffableVar = objectArg; | 
|  | //                                ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:234:20: Error: A value of type 'Object?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = objectNullableArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:235:20: Error: A value of type 'num' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = numArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:236:20: Error: A value of type 'num?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = numNullableArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:237:20: Error: A value of type 'int' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = intArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:238:20: Error: A value of type 'int?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = intNullableArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:239:20: Error: A value of type 'double' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = doubleArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:240:20: Error: A value of type 'double?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = doubleNullableArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:241:20: Error: A value of type 'Function' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = functionArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:242:20: Error: A value of type 'Function?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = functionNullableArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:243:20: Error: A value of type 'void Function()' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = toVoidArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:244:20: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = toVoidNullableArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:245:20: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = tearoffableNullableArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:246:20: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = xNonNullArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:247:20: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = xNonNullNullableArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:248:20: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = xPotentiallyNullArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:249:20: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = xPotentiallyNullNullableArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:250:20: Error: A value of type 'YnonNull' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = yNonNullArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:251:20: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = yNonNullNullableArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:252:20: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = yPotentiallyNullArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:253:20: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   tearoffableVar = yPotentiallyNullNullableArg; | 
|  | //                    ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:255:26: Error: A value of type 'Object' can't be assigned to a variable of type 'XnonNull'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   XnonNull xNonNullVar = objectArg; | 
|  | //                          ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:256:17: Error: A value of type 'Object?' can't be assigned to a variable of type 'XnonNull'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   xNonNullVar = objectNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:257:17: Error: A value of type 'num' can't be assigned to a variable of type 'XnonNull'. | 
|  | //   xNonNullVar = numArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:258:17: Error: A value of type 'num?' can't be assigned to a variable of type 'XnonNull'. | 
|  | //   xNonNullVar = numNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:259:17: Error: A value of type 'int' can't be assigned to a variable of type 'XnonNull'. | 
|  | //   xNonNullVar = intArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:260:17: Error: A value of type 'int?' can't be assigned to a variable of type 'XnonNull'. | 
|  | //   xNonNullVar = intNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:261:17: Error: A value of type 'double' can't be assigned to a variable of type 'XnonNull'. | 
|  | //   xNonNullVar = doubleArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:262:17: Error: A value of type 'double?' can't be assigned to a variable of type 'XnonNull'. | 
|  | //   xNonNullVar = doubleNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:263:17: Error: A value of type 'Function' can't be assigned to a variable of type 'XnonNull'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   xNonNullVar = functionArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:264:17: Error: A value of type 'Function?' can't be assigned to a variable of type 'XnonNull'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   xNonNullVar = functionNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:265:17: Error: A value of type 'void Function()' can't be assigned to a variable of type 'XnonNull'. | 
|  | //   xNonNullVar = toVoidArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:266:17: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'XnonNull'. | 
|  | //   xNonNullVar = toVoidNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:267:17: Error: A value of type 'Tearoffable' can't be assigned to a variable of type 'XnonNull'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   xNonNullVar = tearoffableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:268:17: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'XnonNull'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   xNonNullVar = tearoffableNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:269:17: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'XnonNull'. | 
|  | //   xNonNullVar = xNonNullNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:270:17: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'XnonNull'. | 
|  | //   xNonNullVar = xPotentiallyNullArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:271:17: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'XnonNull'. | 
|  | //   xNonNullVar = xPotentiallyNullNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:272:17: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'XnonNull'. | 
|  | //   xNonNullVar = yNonNullNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:273:17: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'XnonNull'. | 
|  | //   xNonNullVar = yPotentiallyNullArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:274:17: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'XnonNull'. | 
|  | //   xNonNullVar = yPotentiallyNullNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:276:42: Error: A value of type 'Object' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   XpotentiallyNull xPotentiallyNullVar = objectArg; | 
|  | //                                          ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:277:25: Error: A value of type 'Object?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   xPotentiallyNullVar = objectNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:278:25: Error: A value of type 'num' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //   xPotentiallyNullVar = numArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:279:25: Error: A value of type 'num?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //   xPotentiallyNullVar = numNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:280:25: Error: A value of type 'int' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //   xPotentiallyNullVar = intArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:281:25: Error: A value of type 'int?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //   xPotentiallyNullVar = intNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:282:25: Error: A value of type 'double' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //   xPotentiallyNullVar = doubleArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:283:25: Error: A value of type 'double?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //   xPotentiallyNullVar = doubleNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:284:25: Error: A value of type 'Function' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   xPotentiallyNullVar = functionArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:285:25: Error: A value of type 'Function?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   xPotentiallyNullVar = functionNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:286:25: Error: A value of type 'void Function()' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //   xPotentiallyNullVar = toVoidArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:287:25: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //   xPotentiallyNullVar = toVoidNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:288:25: Error: A value of type 'Tearoffable' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   xPotentiallyNullVar = tearoffableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:289:25: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   xPotentiallyNullVar = tearoffableNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:290:25: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //   xPotentiallyNullVar = xNonNullArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:291:25: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //   xPotentiallyNullVar = xNonNullNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:292:25: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //   xPotentiallyNullVar = xPotentiallyNullNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:293:25: Error: A value of type 'YnonNull' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //   xPotentiallyNullVar = yNonNullArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:294:25: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //   xPotentiallyNullVar = yNonNullNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:295:25: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | //   xPotentiallyNullVar = yPotentiallyNullNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:297:26: Error: A value of type 'Object' can't be assigned to a variable of type 'YnonNull'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   YnonNull yNonNullVar = objectArg; | 
|  | //                          ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:298:17: Error: A value of type 'Object?' can't be assigned to a variable of type 'YnonNull'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   yNonNullVar = objectNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:299:17: Error: A value of type 'num' can't be assigned to a variable of type 'YnonNull'. | 
|  | //   yNonNullVar = numArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:300:17: Error: A value of type 'num?' can't be assigned to a variable of type 'YnonNull'. | 
|  | //   yNonNullVar = numNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:301:17: Error: A value of type 'int' can't be assigned to a variable of type 'YnonNull'. | 
|  | //   yNonNullVar = intArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:302:17: Error: A value of type 'int?' can't be assigned to a variable of type 'YnonNull'. | 
|  | //   yNonNullVar = intNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:303:17: Error: A value of type 'double' can't be assigned to a variable of type 'YnonNull'. | 
|  | //   yNonNullVar = doubleArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:304:17: Error: A value of type 'double?' can't be assigned to a variable of type 'YnonNull'. | 
|  | //   yNonNullVar = doubleNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:305:17: Error: A value of type 'Function' can't be assigned to a variable of type 'YnonNull'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   yNonNullVar = functionArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:306:17: Error: A value of type 'Function?' can't be assigned to a variable of type 'YnonNull'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   yNonNullVar = functionNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:307:17: Error: A value of type 'void Function()' can't be assigned to a variable of type 'YnonNull'. | 
|  | //   yNonNullVar = toVoidArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:308:17: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'YnonNull'. | 
|  | //   yNonNullVar = toVoidNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:309:17: Error: A value of type 'Tearoffable' can't be assigned to a variable of type 'YnonNull'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   yNonNullVar = tearoffableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:310:17: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'YnonNull'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   yNonNullVar = tearoffableNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:311:17: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'YnonNull'. | 
|  | //   yNonNullVar = xNonNullArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:312:17: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'YnonNull'. | 
|  | //   yNonNullVar = xNonNullNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:313:17: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'YnonNull'. | 
|  | //   yNonNullVar = xPotentiallyNullArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:314:17: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'YnonNull'. | 
|  | //   yNonNullVar = xPotentiallyNullNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:315:17: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'YnonNull'. | 
|  | //   yNonNullVar = yNonNullNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:316:17: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'YnonNull'. | 
|  | //   yNonNullVar = yPotentiallyNullArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:317:17: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'YnonNull'. | 
|  | //   yNonNullVar = yPotentiallyNullNullableArg; | 
|  | //                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:319:42: Error: A value of type 'Object' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   YpotentiallyNull yPotentiallyNullVar = objectArg; | 
|  | //                                          ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:320:25: Error: A value of type 'Object?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //  - 'Object' is from 'dart:core'. | 
|  | //   yPotentiallyNullVar = objectNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:321:25: Error: A value of type 'num' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //   yPotentiallyNullVar = numArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:322:25: Error: A value of type 'num?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //   yPotentiallyNullVar = numNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:323:25: Error: A value of type 'int' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //   yPotentiallyNullVar = intArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:324:25: Error: A value of type 'int?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //   yPotentiallyNullVar = intNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:325:25: Error: A value of type 'double' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //   yPotentiallyNullVar = doubleArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:326:25: Error: A value of type 'double?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //   yPotentiallyNullVar = doubleNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:327:25: Error: A value of type 'Function' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   yPotentiallyNullVar = functionArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:328:25: Error: A value of type 'Function?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //  - 'Function' is from 'dart:core'. | 
|  | //   yPotentiallyNullVar = functionNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:329:25: Error: A value of type 'void Function()' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //   yPotentiallyNullVar = toVoidArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:330:25: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //   yPotentiallyNullVar = toVoidNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:331:25: Error: A value of type 'Tearoffable' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   yPotentiallyNullVar = tearoffableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:332:25: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //  - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | //   yPotentiallyNullVar = tearoffableNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:333:25: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //   yPotentiallyNullVar = xNonNullArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:334:25: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //   yPotentiallyNullVar = xNonNullNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:335:25: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //   yPotentiallyNullVar = xPotentiallyNullArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:336:25: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //   yPotentiallyNullVar = xPotentiallyNullNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:337:25: Error: A value of type 'YnonNull' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //   yPotentiallyNullVar = yNonNullArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:338:25: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //   yPotentiallyNullVar = yNonNullNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/nnbd/assignability.dart:339:25: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | //   yPotentiallyNullVar = yPotentiallyNullNullableArg; | 
|  | //                         ^ | 
|  | // | 
|  | import self as self; | 
|  | import "dart:core" as core; | 
|  |  | 
|  | class Tearoffable extends core::Object { | 
|  | synthetic constructor •() → self::Tearoffable | 
|  | : super core::Object::•() | 
|  | ; | 
|  | method call() → void {} | 
|  | } | 
|  | static method ok<XnonNull extends core::Object = core::Object, YnonNull extends self::ok::XnonNull = core::Object, XpotentiallyNull extends core::Object? = core::Object?, YpotentiallyNull extends self::ok::XpotentiallyNull% = core::Object?>(dynamic dynamicArg, core::Object objectArg, core::num numArg, core::int intArg, core::double doubleArg, core::Function functionArg, () → void toVoidArg, self::Tearoffable tearoffableArg, self::ok::XnonNull xNonNullArg, self::ok::XpotentiallyNull% xPotentiallyNullArg, self::ok::YnonNull yNonNullArg, self::ok::YpotentiallyNull% yPotentiallyNullArg) → dynamic { | 
|  | dynamic dynamicVar = dynamicArg; | 
|  | dynamicVar = objectArg; | 
|  | dynamicVar = numArg; | 
|  | dynamicVar = intArg; | 
|  | dynamicVar = doubleArg; | 
|  | dynamicVar = functionArg; | 
|  | dynamicVar = toVoidArg; | 
|  | dynamicVar = tearoffableArg; | 
|  | dynamicVar = xNonNullArg; | 
|  | dynamicVar = xPotentiallyNullArg; | 
|  | dynamicVar = yNonNullArg; | 
|  | dynamicVar = yPotentiallyNullArg; | 
|  | core::Object objectVar = dynamicArg as{TypeError,ForDynamic,ForNonNullableByDefault} core::Object; | 
|  | objectVar = objectArg; | 
|  | objectVar = numArg; | 
|  | objectVar = intArg; | 
|  | objectVar = functionArg; | 
|  | objectVar = toVoidArg; | 
|  | objectVar = tearoffableArg; | 
|  | objectVar = xNonNullArg; | 
|  | objectVar = yNonNullArg; | 
|  | core::num numVar = dynamicArg as{TypeError,ForDynamic,ForNonNullableByDefault} core::num; | 
|  | numVar = numArg; | 
|  | numVar = intArg; | 
|  | numVar = doubleArg; | 
|  | core::int intVar = dynamicArg as{TypeError,ForDynamic,ForNonNullableByDefault} core::int; | 
|  | intVar = intArg; | 
|  | core::double doubleVar = dynamicArg as{TypeError,ForDynamic,ForNonNullableByDefault} core::double; | 
|  | doubleVar = doubleArg; | 
|  | core::Function functionVar = dynamicArg as{TypeError,ForDynamic,ForNonNullableByDefault} core::Function; | 
|  | functionVar = functionArg; | 
|  | functionVar = toVoidArg; | 
|  | functionVar = let final self::Tearoffable #t1 = tearoffableArg in #t1.==(null) ?{() → void} null : #t1.{self::Tearoffable::call}; | 
|  | () → void toVoidVar = dynamicArg as{TypeError,ForDynamic,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = toVoidArg; | 
|  | toVoidVar = let final self::Tearoffable #t2 = tearoffableArg in #t2.==(null) ?{() → void} null : #t2.{self::Tearoffable::call}; | 
|  | self::Tearoffable tearoffableVar = dynamicArg as{TypeError,ForDynamic,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = tearoffableArg; | 
|  | self::ok::XnonNull xNonNullVar = dynamicArg as{TypeError,ForDynamic,ForNonNullableByDefault} self::ok::XnonNull; | 
|  | xNonNullVar = xNonNullArg; | 
|  | xNonNullVar = yNonNullArg; | 
|  | self::ok::YnonNull yNonNullVar = dynamicArg as{TypeError,ForDynamic,ForNonNullableByDefault} self::ok::YnonNull; | 
|  | yNonNullVar = yNonNullArg; | 
|  | self::ok::XpotentiallyNull% xPotentiallyNullVar = dynamicArg as{TypeError,ForDynamic,ForNonNullableByDefault} self::ok::XpotentiallyNull%; | 
|  | xPotentiallyNullVar = xPotentiallyNullArg; | 
|  | xPotentiallyNullVar = yPotentiallyNullArg; | 
|  | self::ok::YpotentiallyNull% yPotentiallyNullVar = dynamicArg as{TypeError,ForDynamic,ForNonNullableByDefault} self::ok::YpotentiallyNull%; | 
|  | yPotentiallyNullVar = yPotentiallyNullArg; | 
|  | } | 
|  | static method error<XnonNull extends core::Object = core::Object, YnonNull extends self::error::XnonNull = core::Object, XpotentiallyNull extends core::Object? = core::Object?, YpotentiallyNull extends self::error::XpotentiallyNull% = core::Object?>(core::Object objectArg, core::Object? objectNullableArg, core::num numArg, core::num? numNullableArg, core::int intArg, core::int? intNullableArg, core::double doubleArg, core::double? doubleNullableArg, core::Function functionArg, core::Function? functionNullableArg, () → void toVoidArg, () →? void toVoidNullableArg, self::Tearoffable tearoffableArg, self::Tearoffable? tearoffableNullableArg, self::error::XnonNull xNonNullArg, self::error::XnonNull? xNonNullNullableArg, self::error::XpotentiallyNull% xPotentiallyNullArg, self::error::XpotentiallyNull? xPotentiallyNullNullableArg, self::error::YnonNull yNonNullArg, self::error::YnonNull? yNonNullNullableArg, self::error::YpotentiallyNull% yPotentiallyNullArg, self::error::YpotentiallyNull? yPotentiallyNullNullableArg) → dynamic { | 
|  | core::Object objectVar = let final<BottomType> #t3 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:114:22: Error: A value of type 'Object?' can't be assigned to a variable of type 'Object'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | Object objectVar = objectNullableArg; | 
|  | ^" in objectNullableArg as{TypeError,ForNonNullableByDefault} core::Object; | 
|  | objectVar = let final<BottomType> #t4 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:115:15: Error: A value of type 'num?' can't be assigned to a variable of type 'Object'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | objectVar = numNullableArg; | 
|  | ^" in numNullableArg as{TypeError,ForNonNullableByDefault} core::Object; | 
|  | objectVar = let final<BottomType> #t5 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:116:15: Error: A value of type 'int?' can't be assigned to a variable of type 'Object'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | objectVar = intNullableArg; | 
|  | ^" in intNullableArg as{TypeError,ForNonNullableByDefault} core::Object; | 
|  | objectVar = let final<BottomType> #t6 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:117:15: Error: A value of type 'double?' can't be assigned to a variable of type 'Object'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | objectVar = doubleNullableArg; | 
|  | ^" in doubleNullableArg as{TypeError,ForNonNullableByDefault} core::Object; | 
|  | objectVar = let final<BottomType> #t7 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:118:15: Error: A value of type 'Function?' can't be assigned to a variable of type 'Object'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | objectVar = functionNullableArg; | 
|  | ^" in functionNullableArg as{TypeError,ForNonNullableByDefault} core::Object; | 
|  | objectVar = let final<BottomType> #t8 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:119:15: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'Object'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | objectVar = toVoidNullableArg; | 
|  | ^" in toVoidNullableArg as{TypeError,ForNonNullableByDefault} core::Object; | 
|  | objectVar = let final<BottomType> #t9 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:120:15: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'Object'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | objectVar = tearoffableNullableArg; | 
|  | ^" in tearoffableNullableArg as{TypeError,ForNonNullableByDefault} core::Object; | 
|  | objectVar = let final<BottomType> #t10 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:121:15: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'Object'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | objectVar = xNonNullNullableArg; | 
|  | ^" in xNonNullNullableArg as{TypeError,ForNonNullableByDefault} core::Object; | 
|  | objectVar = let final<BottomType> #t11 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:122:15: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'Object'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | objectVar = xPotentiallyNullArg; | 
|  | ^" in xPotentiallyNullArg as{TypeError,ForNonNullableByDefault} core::Object; | 
|  | objectVar = let final<BottomType> #t12 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:123:15: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'Object'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | objectVar = xPotentiallyNullNullableArg; | 
|  | ^" in xPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} core::Object; | 
|  | objectVar = let final<BottomType> #t13 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:124:15: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'Object'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | objectVar = yNonNullNullableArg; | 
|  | ^" in yNonNullNullableArg as{TypeError,ForNonNullableByDefault} core::Object; | 
|  | objectVar = let final<BottomType> #t14 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:125:15: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'Object'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | objectVar = yPotentiallyNullArg; | 
|  | ^" in yPotentiallyNullArg as{TypeError,ForNonNullableByDefault} core::Object; | 
|  | objectVar = let final<BottomType> #t15 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:126:15: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'Object'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | objectVar = yPotentiallyNullNullableArg; | 
|  | ^" in yPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} core::Object; | 
|  | core::num numVar = let final<BottomType> #t16 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:128:16: Error: A value of type 'Object' can't be assigned to a variable of type 'num'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | num numVar = objectArg; | 
|  | ^" in objectArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t17 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:129:12: Error: A value of type 'Object?' can't be assigned to a variable of type 'num'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | numVar = objectNullableArg; | 
|  | ^" in objectNullableArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t18 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:130:12: Error: A value of type 'num?' can't be assigned to a variable of type 'num'. | 
|  | numVar = numNullableArg; | 
|  | ^" in numNullableArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t19 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:131:12: Error: A value of type 'int?' can't be assigned to a variable of type 'num'. | 
|  | numVar = intNullableArg; | 
|  | ^" in intNullableArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t20 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:132:12: Error: A value of type 'double?' can't be assigned to a variable of type 'num'. | 
|  | numVar = doubleNullableArg; | 
|  | ^" in doubleNullableArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t21 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:133:12: Error: A value of type 'Function' can't be assigned to a variable of type 'num'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | numVar = functionArg; | 
|  | ^" in functionArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t22 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:134:12: Error: A value of type 'Function?' can't be assigned to a variable of type 'num'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | numVar = functionNullableArg; | 
|  | ^" in functionNullableArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t23 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:135:12: Error: A value of type 'void Function()' can't be assigned to a variable of type 'num'. | 
|  | numVar = toVoidArg; | 
|  | ^" in toVoidArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t24 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:136:12: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'num'. | 
|  | numVar = toVoidNullableArg; | 
|  | ^" in toVoidNullableArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t25 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:137:12: Error: A value of type 'Tearoffable' can't be assigned to a variable of type 'num'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | numVar = tearoffableArg; | 
|  | ^" in tearoffableArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t26 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:138:12: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'num'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | numVar = tearoffableNullableArg; | 
|  | ^" in tearoffableNullableArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t27 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:139:12: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'num'. | 
|  | numVar = xNonNullArg; | 
|  | ^" in xNonNullArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t28 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:140:12: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'num'. | 
|  | numVar = xNonNullNullableArg; | 
|  | ^" in xNonNullNullableArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t29 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:141:12: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'num'. | 
|  | numVar = xPotentiallyNullArg; | 
|  | ^" in xPotentiallyNullArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t30 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:142:12: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'num'. | 
|  | numVar = xPotentiallyNullNullableArg; | 
|  | ^" in xPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t31 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:143:12: Error: A value of type 'YnonNull' can't be assigned to a variable of type 'num'. | 
|  | numVar = yNonNullArg; | 
|  | ^" in yNonNullArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t32 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:144:12: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'num'. | 
|  | numVar = yNonNullNullableArg; | 
|  | ^" in yNonNullNullableArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t33 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:145:12: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'num'. | 
|  | numVar = yPotentiallyNullArg; | 
|  | ^" in yPotentiallyNullArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | numVar = let final<BottomType> #t34 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:146:12: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'num'. | 
|  | numVar = yPotentiallyNullNullableArg; | 
|  | ^" in yPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} core::num; | 
|  | core::int intVar = let final<BottomType> #t35 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:148:16: Error: A value of type 'Object' can't be assigned to a variable of type 'int'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | int intVar = objectArg; | 
|  | ^" in objectArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t36 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:149:12: Error: A value of type 'Object?' can't be assigned to a variable of type 'int'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | intVar = objectNullableArg; | 
|  | ^" in objectNullableArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t37 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:150:12: Error: A value of type 'num' can't be assigned to a variable of type 'int'. | 
|  | intVar = numArg; | 
|  | ^" in numArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t38 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:151:12: Error: A value of type 'num?' can't be assigned to a variable of type 'int'. | 
|  | intVar = numNullableArg; | 
|  | ^" in numNullableArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t39 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:152:12: Error: A value of type 'int?' can't be assigned to a variable of type 'int'. | 
|  | intVar = intNullableArg; | 
|  | ^" in intNullableArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t40 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:153:12: Error: A value of type 'double' can't be assigned to a variable of type 'int'. | 
|  | intVar = doubleArg; | 
|  | ^" in doubleArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t41 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:154:12: Error: A value of type 'double?' can't be assigned to a variable of type 'int'. | 
|  | intVar = doubleNullableArg; | 
|  | ^" in doubleNullableArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t42 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:155:12: Error: A value of type 'Function' can't be assigned to a variable of type 'int'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | intVar = functionArg; | 
|  | ^" in functionArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t43 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:156:12: Error: A value of type 'Function?' can't be assigned to a variable of type 'int'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | intVar = functionNullableArg; | 
|  | ^" in functionNullableArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t44 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:157:12: Error: A value of type 'void Function()' can't be assigned to a variable of type 'int'. | 
|  | intVar = toVoidArg; | 
|  | ^" in toVoidArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t45 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:158:12: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'int'. | 
|  | intVar = toVoidNullableArg; | 
|  | ^" in toVoidNullableArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t46 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:159:12: Error: A value of type 'Tearoffable' can't be assigned to a variable of type 'int'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | intVar = tearoffableArg; | 
|  | ^" in tearoffableArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t47 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:160:12: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'int'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | intVar = tearoffableNullableArg; | 
|  | ^" in tearoffableNullableArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t48 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:161:12: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'int'. | 
|  | intVar = xNonNullArg; | 
|  | ^" in xNonNullArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t49 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:162:12: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'int'. | 
|  | intVar = xNonNullNullableArg; | 
|  | ^" in xNonNullNullableArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t50 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:163:12: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'int'. | 
|  | intVar = xPotentiallyNullArg; | 
|  | ^" in xPotentiallyNullArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t51 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:164:12: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'int'. | 
|  | intVar = xPotentiallyNullNullableArg; | 
|  | ^" in xPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t52 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:165:12: Error: A value of type 'YnonNull' can't be assigned to a variable of type 'int'. | 
|  | intVar = yNonNullArg; | 
|  | ^" in yNonNullArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t53 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:166:12: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'int'. | 
|  | intVar = yNonNullNullableArg; | 
|  | ^" in yNonNullNullableArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t54 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:167:12: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'int'. | 
|  | intVar = yPotentiallyNullArg; | 
|  | ^" in yPotentiallyNullArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | intVar = let final<BottomType> #t55 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:168:12: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'int'. | 
|  | intVar = yPotentiallyNullNullableArg; | 
|  | ^" in yPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} core::int; | 
|  | core::double doubleVar = let final<BottomType> #t56 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:170:22: Error: A value of type 'Object' can't be assigned to a variable of type 'double'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | double doubleVar = objectArg; | 
|  | ^" in objectArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t57 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:171:15: Error: A value of type 'Object?' can't be assigned to a variable of type 'double'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | doubleVar = objectNullableArg; | 
|  | ^" in objectNullableArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t58 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:172:15: Error: A value of type 'num' can't be assigned to a variable of type 'double'. | 
|  | doubleVar = numArg; | 
|  | ^" in numArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t59 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:173:15: Error: A value of type 'num?' can't be assigned to a variable of type 'double'. | 
|  | doubleVar = numNullableArg; | 
|  | ^" in numNullableArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t60 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:174:15: Error: A value of type 'int' can't be assigned to a variable of type 'double'. | 
|  | doubleVar = intArg; | 
|  | ^" in intArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t61 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:175:15: Error: A value of type 'int?' can't be assigned to a variable of type 'double'. | 
|  | doubleVar = intNullableArg; | 
|  | ^" in intNullableArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t62 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:176:15: Error: A value of type 'double?' can't be assigned to a variable of type 'double'. | 
|  | doubleVar = doubleNullableArg; | 
|  | ^" in doubleNullableArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t63 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:177:15: Error: A value of type 'Function' can't be assigned to a variable of type 'double'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | doubleVar = functionArg; | 
|  | ^" in functionArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t64 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:178:15: Error: A value of type 'Function?' can't be assigned to a variable of type 'double'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | doubleVar = functionNullableArg; | 
|  | ^" in functionNullableArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t65 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:179:15: Error: A value of type 'void Function()' can't be assigned to a variable of type 'double'. | 
|  | doubleVar = toVoidArg; | 
|  | ^" in toVoidArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t66 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:180:15: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'double'. | 
|  | doubleVar = toVoidNullableArg; | 
|  | ^" in toVoidNullableArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t67 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:181:15: Error: A value of type 'Tearoffable' can't be assigned to a variable of type 'double'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | doubleVar = tearoffableArg; | 
|  | ^" in tearoffableArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t68 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:182:15: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'double'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | doubleVar = tearoffableNullableArg; | 
|  | ^" in tearoffableNullableArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t69 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:183:15: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'double'. | 
|  | doubleVar = xNonNullArg; | 
|  | ^" in xNonNullArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t70 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:184:15: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'double'. | 
|  | doubleVar = xNonNullNullableArg; | 
|  | ^" in xNonNullNullableArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t71 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:185:15: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'double'. | 
|  | doubleVar = xPotentiallyNullArg; | 
|  | ^" in xPotentiallyNullArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t72 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:186:15: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'double'. | 
|  | doubleVar = xPotentiallyNullNullableArg; | 
|  | ^" in xPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t73 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:187:15: Error: A value of type 'YnonNull' can't be assigned to a variable of type 'double'. | 
|  | doubleVar = yNonNullArg; | 
|  | ^" in yNonNullArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t74 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:188:15: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'double'. | 
|  | doubleVar = yNonNullNullableArg; | 
|  | ^" in yNonNullNullableArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t75 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:189:15: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'double'. | 
|  | doubleVar = yPotentiallyNullArg; | 
|  | ^" in yPotentiallyNullArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | doubleVar = let final<BottomType> #t76 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:190:15: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'double'. | 
|  | doubleVar = yPotentiallyNullNullableArg; | 
|  | ^" in yPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} core::double; | 
|  | core::Function functionVar = let final<BottomType> #t77 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:192:26: Error: A value of type 'Object' can't be assigned to a variable of type 'Function'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | Function functionVar = objectArg; | 
|  | ^" in objectArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t78 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:193:17: Error: A value of type 'Object?' can't be assigned to a variable of type 'Function'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = objectNullableArg; | 
|  | ^" in objectNullableArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t79 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:194:17: Error: A value of type 'num' can't be assigned to a variable of type 'Function'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = numArg; | 
|  | ^" in numArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t80 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:195:17: Error: A value of type 'num?' can't be assigned to a variable of type 'Function'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = numNullableArg; | 
|  | ^" in numNullableArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t81 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:196:17: Error: A value of type 'int' can't be assigned to a variable of type 'Function'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = intArg; | 
|  | ^" in intArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t82 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:197:17: Error: A value of type 'int?' can't be assigned to a variable of type 'Function'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = intNullableArg; | 
|  | ^" in intNullableArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t83 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:198:17: Error: A value of type 'double' can't be assigned to a variable of type 'Function'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = doubleArg; | 
|  | ^" in doubleArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t84 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:199:17: Error: A value of type 'double?' can't be assigned to a variable of type 'Function'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = doubleNullableArg; | 
|  | ^" in doubleNullableArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t85 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:200:17: Error: A value of type 'Function?' can't be assigned to a variable of type 'Function'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = functionNullableArg; | 
|  | ^" in functionNullableArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t86 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:201:17: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'Function'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = toVoidNullableArg; | 
|  | ^" in toVoidNullableArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t87 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:202:17: Error: Can't tear off method 'call' from a potentially null value. | 
|  | functionVar = tearoffableNullableArg; | 
|  | ^" in tearoffableNullableArg as{TypeError} core::Function; | 
|  | functionVar = let final<BottomType> #t88 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:203:17: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'Function'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = xNonNullArg; | 
|  | ^" in xNonNullArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t89 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:204:17: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'Function'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = xNonNullNullableArg; | 
|  | ^" in xNonNullNullableArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t90 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:205:17: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'Function'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = xPotentiallyNullArg; | 
|  | ^" in xPotentiallyNullArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t91 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:206:17: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'Function'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = xPotentiallyNullNullableArg; | 
|  | ^" in xPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t92 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:207:17: Error: A value of type 'YnonNull' can't be assigned to a variable of type 'Function'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = yNonNullArg; | 
|  | ^" in yNonNullArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t93 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:208:17: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'Function'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = yNonNullNullableArg; | 
|  | ^" in yNonNullNullableArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t94 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:209:17: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'Function'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = yPotentiallyNullArg; | 
|  | ^" in yPotentiallyNullArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | functionVar = let final<BottomType> #t95 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:210:17: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'Function'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | functionVar = yPotentiallyNullNullableArg; | 
|  | ^" in yPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} core::Function; | 
|  | () → void toVoidVar = let final<BottomType> #t96 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:212:31: Error: A value of type 'Object' can't be assigned to a variable of type 'void Function()'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | void Function() toVoidVar = objectArg; | 
|  | ^" in objectArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t97 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:213:15: Error: A value of type 'Object?' can't be assigned to a variable of type 'void Function()'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | toVoidVar = objectNullableArg; | 
|  | ^" in objectNullableArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t98 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:214:15: Error: A value of type 'num' can't be assigned to a variable of type 'void Function()'. | 
|  | toVoidVar = numArg; | 
|  | ^" in numArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t99 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:215:15: Error: A value of type 'num?' can't be assigned to a variable of type 'void Function()'. | 
|  | toVoidVar = numNullableArg; | 
|  | ^" in numNullableArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t100 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:216:15: Error: A value of type 'int' can't be assigned to a variable of type 'void Function()'. | 
|  | toVoidVar = intArg; | 
|  | ^" in intArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t101 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:217:15: Error: A value of type 'int?' can't be assigned to a variable of type 'void Function()'. | 
|  | toVoidVar = intNullableArg; | 
|  | ^" in intNullableArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t102 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:218:15: Error: A value of type 'double' can't be assigned to a variable of type 'void Function()'. | 
|  | toVoidVar = doubleArg; | 
|  | ^" in doubleArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t103 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:219:15: Error: A value of type 'double?' can't be assigned to a variable of type 'void Function()'. | 
|  | toVoidVar = doubleNullableArg; | 
|  | ^" in doubleNullableArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t104 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:220:15: Error: A value of type 'Function' can't be assigned to a variable of type 'void Function()'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | toVoidVar = functionArg; | 
|  | ^" in functionArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t105 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:221:15: Error: A value of type 'Function?' can't be assigned to a variable of type 'void Function()'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | toVoidVar = functionNullableArg; | 
|  | ^" in functionNullableArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t106 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:222:15: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'void Function()'. | 
|  | toVoidVar = toVoidNullableArg; | 
|  | ^" in toVoidNullableArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t107 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:223:15: Error: Can't tear off method 'call' from a potentially null value. | 
|  | toVoidVar = tearoffableNullableArg; | 
|  | ^" in tearoffableNullableArg as{TypeError} () → void; | 
|  | toVoidVar = let final<BottomType> #t108 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:224:15: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'void Function()'. | 
|  | toVoidVar = xNonNullArg; | 
|  | ^" in xNonNullArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t109 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:225:15: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'void Function()'. | 
|  | toVoidVar = xNonNullNullableArg; | 
|  | ^" in xNonNullNullableArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t110 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:226:15: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'void Function()'. | 
|  | toVoidVar = xPotentiallyNullArg; | 
|  | ^" in xPotentiallyNullArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t111 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:227:15: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'void Function()'. | 
|  | toVoidVar = xPotentiallyNullNullableArg; | 
|  | ^" in xPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t112 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:228:15: Error: A value of type 'YnonNull' can't be assigned to a variable of type 'void Function()'. | 
|  | toVoidVar = yNonNullArg; | 
|  | ^" in yNonNullArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t113 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:229:15: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'void Function()'. | 
|  | toVoidVar = yNonNullNullableArg; | 
|  | ^" in yNonNullNullableArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t114 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:230:15: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'void Function()'. | 
|  | toVoidVar = yPotentiallyNullArg; | 
|  | ^" in yPotentiallyNullArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | toVoidVar = let final<BottomType> #t115 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:231:15: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'void Function()'. | 
|  | toVoidVar = yPotentiallyNullNullableArg; | 
|  | ^" in yPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} () → void; | 
|  | self::Tearoffable tearoffableVar = let final<BottomType> #t116 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:233:32: Error: A value of type 'Object' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | Tearoffable tearoffableVar = objectArg; | 
|  | ^" in objectArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t117 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:234:20: Error: A value of type 'Object?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = objectNullableArg; | 
|  | ^" in objectNullableArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t118 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:235:20: Error: A value of type 'num' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = numArg; | 
|  | ^" in numArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t119 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:236:20: Error: A value of type 'num?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = numNullableArg; | 
|  | ^" in numNullableArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t120 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:237:20: Error: A value of type 'int' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = intArg; | 
|  | ^" in intArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t121 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:238:20: Error: A value of type 'int?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = intNullableArg; | 
|  | ^" in intNullableArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t122 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:239:20: Error: A value of type 'double' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = doubleArg; | 
|  | ^" in doubleArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t123 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:240:20: Error: A value of type 'double?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = doubleNullableArg; | 
|  | ^" in doubleNullableArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t124 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:241:20: Error: A value of type 'Function' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = functionArg; | 
|  | ^" in functionArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t125 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:242:20: Error: A value of type 'Function?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = functionNullableArg; | 
|  | ^" in functionNullableArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t126 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:243:20: Error: A value of type 'void Function()' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = toVoidArg; | 
|  | ^" in toVoidArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t127 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:244:20: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = toVoidNullableArg; | 
|  | ^" in toVoidNullableArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t128 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:245:20: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = tearoffableNullableArg; | 
|  | ^" in tearoffableNullableArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t129 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:246:20: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = xNonNullArg; | 
|  | ^" in xNonNullArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t130 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:247:20: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = xNonNullNullableArg; | 
|  | ^" in xNonNullNullableArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t131 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:248:20: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = xPotentiallyNullArg; | 
|  | ^" in xPotentiallyNullArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t132 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:249:20: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = xPotentiallyNullNullableArg; | 
|  | ^" in xPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t133 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:250:20: Error: A value of type 'YnonNull' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = yNonNullArg; | 
|  | ^" in yNonNullArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t134 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:251:20: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = yNonNullNullableArg; | 
|  | ^" in yNonNullNullableArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t135 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:252:20: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = yPotentiallyNullArg; | 
|  | ^" in yPotentiallyNullArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | tearoffableVar = let final<BottomType> #t136 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:253:20: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'Tearoffable'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | tearoffableVar = yPotentiallyNullNullableArg; | 
|  | ^" in yPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} self::Tearoffable; | 
|  | self::error::XnonNull xNonNullVar = let final<BottomType> #t137 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:255:26: Error: A value of type 'Object' can't be assigned to a variable of type 'XnonNull'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | XnonNull xNonNullVar = objectArg; | 
|  | ^" in objectArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t138 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:256:17: Error: A value of type 'Object?' can't be assigned to a variable of type 'XnonNull'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | xNonNullVar = objectNullableArg; | 
|  | ^" in objectNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t139 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:257:17: Error: A value of type 'num' can't be assigned to a variable of type 'XnonNull'. | 
|  | xNonNullVar = numArg; | 
|  | ^" in numArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t140 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:258:17: Error: A value of type 'num?' can't be assigned to a variable of type 'XnonNull'. | 
|  | xNonNullVar = numNullableArg; | 
|  | ^" in numNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t141 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:259:17: Error: A value of type 'int' can't be assigned to a variable of type 'XnonNull'. | 
|  | xNonNullVar = intArg; | 
|  | ^" in intArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t142 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:260:17: Error: A value of type 'int?' can't be assigned to a variable of type 'XnonNull'. | 
|  | xNonNullVar = intNullableArg; | 
|  | ^" in intNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t143 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:261:17: Error: A value of type 'double' can't be assigned to a variable of type 'XnonNull'. | 
|  | xNonNullVar = doubleArg; | 
|  | ^" in doubleArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t144 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:262:17: Error: A value of type 'double?' can't be assigned to a variable of type 'XnonNull'. | 
|  | xNonNullVar = doubleNullableArg; | 
|  | ^" in doubleNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t145 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:263:17: Error: A value of type 'Function' can't be assigned to a variable of type 'XnonNull'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | xNonNullVar = functionArg; | 
|  | ^" in functionArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t146 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:264:17: Error: A value of type 'Function?' can't be assigned to a variable of type 'XnonNull'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | xNonNullVar = functionNullableArg; | 
|  | ^" in functionNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t147 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:265:17: Error: A value of type 'void Function()' can't be assigned to a variable of type 'XnonNull'. | 
|  | xNonNullVar = toVoidArg; | 
|  | ^" in toVoidArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t148 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:266:17: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'XnonNull'. | 
|  | xNonNullVar = toVoidNullableArg; | 
|  | ^" in toVoidNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t149 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:267:17: Error: A value of type 'Tearoffable' can't be assigned to a variable of type 'XnonNull'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | xNonNullVar = tearoffableArg; | 
|  | ^" in tearoffableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t150 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:268:17: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'XnonNull'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | xNonNullVar = tearoffableNullableArg; | 
|  | ^" in tearoffableNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t151 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:269:17: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'XnonNull'. | 
|  | xNonNullVar = xNonNullNullableArg; | 
|  | ^" in xNonNullNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t152 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:270:17: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'XnonNull'. | 
|  | xNonNullVar = xPotentiallyNullArg; | 
|  | ^" in xPotentiallyNullArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t153 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:271:17: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'XnonNull'. | 
|  | xNonNullVar = xPotentiallyNullNullableArg; | 
|  | ^" in xPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t154 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:272:17: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'XnonNull'. | 
|  | xNonNullVar = yNonNullNullableArg; | 
|  | ^" in yNonNullNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t155 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:273:17: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'XnonNull'. | 
|  | xNonNullVar = yPotentiallyNullArg; | 
|  | ^" in yPotentiallyNullArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xNonNullVar = let final<BottomType> #t156 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:274:17: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'XnonNull'. | 
|  | xNonNullVar = yPotentiallyNullNullableArg; | 
|  | ^" in yPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | self::error::XpotentiallyNull% xPotentiallyNullVar = let final<BottomType> #t157 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:276:42: Error: A value of type 'Object' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | XpotentiallyNull xPotentiallyNullVar = objectArg; | 
|  | ^" in objectArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t158 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:277:25: Error: A value of type 'Object?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | xPotentiallyNullVar = objectNullableArg; | 
|  | ^" in objectNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t159 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:278:25: Error: A value of type 'num' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | xPotentiallyNullVar = numArg; | 
|  | ^" in numArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t160 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:279:25: Error: A value of type 'num?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | xPotentiallyNullVar = numNullableArg; | 
|  | ^" in numNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t161 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:280:25: Error: A value of type 'int' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | xPotentiallyNullVar = intArg; | 
|  | ^" in intArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t162 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:281:25: Error: A value of type 'int?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | xPotentiallyNullVar = intNullableArg; | 
|  | ^" in intNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t163 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:282:25: Error: A value of type 'double' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | xPotentiallyNullVar = doubleArg; | 
|  | ^" in doubleArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t164 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:283:25: Error: A value of type 'double?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | xPotentiallyNullVar = doubleNullableArg; | 
|  | ^" in doubleNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t165 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:284:25: Error: A value of type 'Function' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | xPotentiallyNullVar = functionArg; | 
|  | ^" in functionArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t166 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:285:25: Error: A value of type 'Function?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | xPotentiallyNullVar = functionNullableArg; | 
|  | ^" in functionNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t167 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:286:25: Error: A value of type 'void Function()' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | xPotentiallyNullVar = toVoidArg; | 
|  | ^" in toVoidArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t168 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:287:25: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | xPotentiallyNullVar = toVoidNullableArg; | 
|  | ^" in toVoidNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t169 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:288:25: Error: A value of type 'Tearoffable' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | xPotentiallyNullVar = tearoffableArg; | 
|  | ^" in tearoffableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t170 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:289:25: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | xPotentiallyNullVar = tearoffableNullableArg; | 
|  | ^" in tearoffableNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t171 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:290:25: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | xPotentiallyNullVar = xNonNullArg; | 
|  | ^" in xNonNullArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t172 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:291:25: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | xPotentiallyNullVar = xNonNullNullableArg; | 
|  | ^" in xNonNullNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t173 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:292:25: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | xPotentiallyNullVar = xPotentiallyNullNullableArg; | 
|  | ^" in xPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t174 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:293:25: Error: A value of type 'YnonNull' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | xPotentiallyNullVar = yNonNullArg; | 
|  | ^" in yNonNullArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t175 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:294:25: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | xPotentiallyNullVar = yNonNullNullableArg; | 
|  | ^" in yNonNullNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | xPotentiallyNullVar = let final<BottomType> #t176 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:295:25: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'XpotentiallyNull'. | 
|  | xPotentiallyNullVar = yPotentiallyNullNullableArg; | 
|  | ^" in yPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | self::error::YnonNull yNonNullVar = let final<BottomType> #t177 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:297:26: Error: A value of type 'Object' can't be assigned to a variable of type 'YnonNull'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | YnonNull yNonNullVar = objectArg; | 
|  | ^" in objectArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t178 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:298:17: Error: A value of type 'Object?' can't be assigned to a variable of type 'YnonNull'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | yNonNullVar = objectNullableArg; | 
|  | ^" in objectNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t179 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:299:17: Error: A value of type 'num' can't be assigned to a variable of type 'YnonNull'. | 
|  | yNonNullVar = numArg; | 
|  | ^" in numArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t180 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:300:17: Error: A value of type 'num?' can't be assigned to a variable of type 'YnonNull'. | 
|  | yNonNullVar = numNullableArg; | 
|  | ^" in numNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t181 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:301:17: Error: A value of type 'int' can't be assigned to a variable of type 'YnonNull'. | 
|  | yNonNullVar = intArg; | 
|  | ^" in intArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t182 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:302:17: Error: A value of type 'int?' can't be assigned to a variable of type 'YnonNull'. | 
|  | yNonNullVar = intNullableArg; | 
|  | ^" in intNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t183 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:303:17: Error: A value of type 'double' can't be assigned to a variable of type 'YnonNull'. | 
|  | yNonNullVar = doubleArg; | 
|  | ^" in doubleArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t184 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:304:17: Error: A value of type 'double?' can't be assigned to a variable of type 'YnonNull'. | 
|  | yNonNullVar = doubleNullableArg; | 
|  | ^" in doubleNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t185 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:305:17: Error: A value of type 'Function' can't be assigned to a variable of type 'YnonNull'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | yNonNullVar = functionArg; | 
|  | ^" in functionArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t186 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:306:17: Error: A value of type 'Function?' can't be assigned to a variable of type 'YnonNull'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | yNonNullVar = functionNullableArg; | 
|  | ^" in functionNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t187 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:307:17: Error: A value of type 'void Function()' can't be assigned to a variable of type 'YnonNull'. | 
|  | yNonNullVar = toVoidArg; | 
|  | ^" in toVoidArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t188 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:308:17: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'YnonNull'. | 
|  | yNonNullVar = toVoidNullableArg; | 
|  | ^" in toVoidNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t189 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:309:17: Error: A value of type 'Tearoffable' can't be assigned to a variable of type 'YnonNull'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | yNonNullVar = tearoffableArg; | 
|  | ^" in tearoffableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t190 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:310:17: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'YnonNull'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | yNonNullVar = tearoffableNullableArg; | 
|  | ^" in tearoffableNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t191 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:311:17: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'YnonNull'. | 
|  | yNonNullVar = xNonNullArg; | 
|  | ^" in xNonNullArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t192 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:312:17: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'YnonNull'. | 
|  | yNonNullVar = xNonNullNullableArg; | 
|  | ^" in xNonNullNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t193 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:313:17: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'YnonNull'. | 
|  | yNonNullVar = xPotentiallyNullArg; | 
|  | ^" in xPotentiallyNullArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t194 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:314:17: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'YnonNull'. | 
|  | yNonNullVar = xPotentiallyNullNullableArg; | 
|  | ^" in xPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t195 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:315:17: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'YnonNull'. | 
|  | yNonNullVar = yNonNullNullableArg; | 
|  | ^" in yNonNullNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t196 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:316:17: Error: A value of type 'YpotentiallyNull' can't be assigned to a variable of type 'YnonNull'. | 
|  | yNonNullVar = yPotentiallyNullArg; | 
|  | ^" in yPotentiallyNullArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yNonNullVar = let final<BottomType> #t197 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:317:17: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'YnonNull'. | 
|  | yNonNullVar = yPotentiallyNullNullableArg; | 
|  | ^" in yPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | self::error::YpotentiallyNull% yPotentiallyNullVar = let final<BottomType> #t198 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:319:42: Error: A value of type 'Object' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | YpotentiallyNull yPotentiallyNullVar = objectArg; | 
|  | ^" in objectArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t199 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:320:25: Error: A value of type 'Object?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | - 'Object' is from 'dart:core'. | 
|  | yPotentiallyNullVar = objectNullableArg; | 
|  | ^" in objectNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t200 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:321:25: Error: A value of type 'num' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | yPotentiallyNullVar = numArg; | 
|  | ^" in numArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t201 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:322:25: Error: A value of type 'num?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | yPotentiallyNullVar = numNullableArg; | 
|  | ^" in numNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t202 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:323:25: Error: A value of type 'int' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | yPotentiallyNullVar = intArg; | 
|  | ^" in intArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t203 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:324:25: Error: A value of type 'int?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | yPotentiallyNullVar = intNullableArg; | 
|  | ^" in intNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t204 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:325:25: Error: A value of type 'double' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | yPotentiallyNullVar = doubleArg; | 
|  | ^" in doubleArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t205 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:326:25: Error: A value of type 'double?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | yPotentiallyNullVar = doubleNullableArg; | 
|  | ^" in doubleNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t206 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:327:25: Error: A value of type 'Function' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | yPotentiallyNullVar = functionArg; | 
|  | ^" in functionArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t207 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:328:25: Error: A value of type 'Function?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | - 'Function' is from 'dart:core'. | 
|  | yPotentiallyNullVar = functionNullableArg; | 
|  | ^" in functionNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t208 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:329:25: Error: A value of type 'void Function()' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | yPotentiallyNullVar = toVoidArg; | 
|  | ^" in toVoidArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t209 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:330:25: Error: A value of type 'void Function()?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | yPotentiallyNullVar = toVoidNullableArg; | 
|  | ^" in toVoidNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t210 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:331:25: Error: A value of type 'Tearoffable' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | yPotentiallyNullVar = tearoffableArg; | 
|  | ^" in tearoffableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t211 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:332:25: Error: A value of type 'Tearoffable?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'. | 
|  | yPotentiallyNullVar = tearoffableNullableArg; | 
|  | ^" in tearoffableNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t212 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:333:25: Error: A value of type 'XnonNull' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | yPotentiallyNullVar = xNonNullArg; | 
|  | ^" in xNonNullArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t213 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:334:25: Error: A value of type 'XnonNull?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | yPotentiallyNullVar = xNonNullNullableArg; | 
|  | ^" in xNonNullNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t214 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:335:25: Error: A value of type 'XpotentiallyNull' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | yPotentiallyNullVar = xPotentiallyNullArg; | 
|  | ^" in xPotentiallyNullArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t215 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:336:25: Error: A value of type 'XpotentiallyNull?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | yPotentiallyNullVar = xPotentiallyNullNullableArg; | 
|  | ^" in xPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t216 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:337:25: Error: A value of type 'YnonNull' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | yPotentiallyNullVar = yNonNullArg; | 
|  | ^" in yNonNullArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t217 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:338:25: Error: A value of type 'YnonNull?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | yPotentiallyNullVar = yNonNullNullableArg; | 
|  | ^" in yNonNullNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | yPotentiallyNullVar = let final<BottomType> #t218 = invalid-expression "pkg/front_end/testcases/nnbd/assignability.dart:339:25: Error: A value of type 'YpotentiallyNull?' can't be assigned to a variable of type 'YpotentiallyNull'. | 
|  | yPotentiallyNullVar = yPotentiallyNullNullableArg; | 
|  | ^" in yPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} <BottomType>; | 
|  | } | 
|  | static method main() → dynamic {} |