library /*isNonNullableByDefault*/;
//
// 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' because 'Object?' is nullable and 'Object' isn't.
//  - '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' because 'num?' is nullable and 'Object' isn't.
//  - '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' because 'int?' is nullable and 'Object' isn't.
//  - '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' because 'double?' is nullable and 'Object' isn't.
//  - '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' because 'Function?' is nullable and 'Object' isn't.
//  - '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' because 'void Function()?' is nullable and 'Object' isn't.
//  - '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' because 'Tearoffable?' is nullable and 'Object' isn't.
//  - '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' because 'XnonNull?' is nullable and 'Object' isn't.
//  - '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' because 'XpotentiallyNull' is nullable and 'Object' isn't.
//  - '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' because 'XpotentiallyNull?' is nullable and 'Object' isn't.
//  - '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' because 'YnonNull?' is nullable and 'Object' isn't.
//  - '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' because 'YpotentiallyNull' is nullable and 'Object' isn't.
//  - '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' because 'YpotentiallyNull?' is nullable and 'Object' isn't.
//  - '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' because 'num?' is nullable and 'num' isn't.
//   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' because 'int?' is nullable and 'num' isn't.
//   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' because 'double?' is nullable and 'num' isn't.
//   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' because 'int?' is nullable and 'int' isn't.
//   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' because 'double?' is nullable and 'double' isn't.
//   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' because 'Function?' is nullable and 'Function' isn't.
//  - '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' because 'void Function()?' is nullable and 'Function' isn't.
//  - '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()' because 'void Function()?' is nullable and 'void Function()' isn't.
//   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' because 'Tearoffable?' is nullable and 'Tearoffable' isn't.
//  - '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' because 'XnonNull?' is nullable and 'XnonNull' isn't.
//   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' because 'YnonNull?' is nullable and 'XnonNull' isn't.
//   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' because 'XpotentiallyNull?' is nullable and 'XpotentiallyNull' isn't.
//   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' because 'YpotentiallyNull?' is nullable and 'XpotentiallyNull' isn't.
//   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' because 'YnonNull?' is nullable and 'YnonNull' isn't.
//   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' because 'YpotentiallyNull?' is nullable and 'YpotentiallyNull' isn't.
//   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, YnonNull extends self::ok::XnonNull = core::Object, XpotentiallyNull extends 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 = let dynamic #t1 = dynamicArg in #t1 == null ?{core::Object} #t1 as{TypeError,ForDynamic,ForNonNullableByDefault} core::Object : #t1{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 #t2 = tearoffableArg in #t2 == null ?{() → void} null : #t2.{self::Tearoffable::call}{() → void};
  () → void toVoidVar = dynamicArg as{TypeError,ForDynamic,ForNonNullableByDefault} () → void;
  toVoidVar = toVoidArg;
  toVoidVar = let final self::Tearoffable #t3 = tearoffableArg in #t3 == null ?{() → void} null : #t3.{self::Tearoffable::call}{() → void};
  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, YnonNull extends self::error::XnonNull = core::Object, XpotentiallyNull extends 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 Never #t4 = 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' because 'Object?' is nullable and 'Object' isn't.
 - 'Object' is from 'dart:core'.
  Object objectVar = objectNullableArg;
                     ^" in let core::Object? #t5 = objectNullableArg in #t5 == null ?{core::Object} #t5 as{TypeError,ForNonNullableByDefault} core::Object : #t5{core::Object};
  objectVar = let final Never #t6 = 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' because 'num?' is nullable and 'Object' isn't.
 - 'Object' is from 'dart:core'.
  objectVar = numNullableArg;
              ^" in let core::num? #t7 = numNullableArg in #t7 == null ?{core::Object} #t7 as{TypeError,ForNonNullableByDefault} core::Object : #t7{core::Object};
  objectVar = let final Never #t8 = 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' because 'int?' is nullable and 'Object' isn't.
 - 'Object' is from 'dart:core'.
  objectVar = intNullableArg;
              ^" in let core::int? #t9 = intNullableArg in #t9 == null ?{core::Object} #t9 as{TypeError,ForNonNullableByDefault} core::Object : #t9{core::Object};
  objectVar = let final Never #t10 = 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' because 'double?' is nullable and 'Object' isn't.
 - 'Object' is from 'dart:core'.
  objectVar = doubleNullableArg;
              ^" in let core::double? #t11 = doubleNullableArg in #t11 == null ?{core::Object} #t11 as{TypeError,ForNonNullableByDefault} core::Object : #t11{core::Object};
  objectVar = let final Never #t12 = 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' because 'Function?' is nullable and 'Object' isn't.
 - 'Function' is from 'dart:core'.
 - 'Object' is from 'dart:core'.
  objectVar = functionNullableArg;
              ^" in let core::Function? #t13 = functionNullableArg in #t13 == null ?{core::Object} #t13 as{TypeError,ForNonNullableByDefault} core::Object : #t13{core::Object};
  objectVar = let final Never #t14 = 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' because 'void Function()?' is nullable and 'Object' isn't.
 - 'Object' is from 'dart:core'.
  objectVar = toVoidNullableArg;
              ^" in let () →? void #t15 = toVoidNullableArg in #t15 == null ?{core::Object} #t15 as{TypeError,ForNonNullableByDefault} core::Object : #t15{core::Object};
  objectVar = let final Never #t16 = 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' because 'Tearoffable?' is nullable and 'Object' isn't.
 - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'.
 - 'Object' is from 'dart:core'.
  objectVar = tearoffableNullableArg;
              ^" in let self::Tearoffable? #t17 = tearoffableNullableArg in #t17 == null ?{core::Object} #t17 as{TypeError,ForNonNullableByDefault} core::Object : #t17{core::Object};
  objectVar = let final Never #t18 = 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' because 'XnonNull?' is nullable and 'Object' isn't.
 - 'Object' is from 'dart:core'.
  objectVar = xNonNullNullableArg;
              ^" in let self::error::XnonNull? #t19 = xNonNullNullableArg in #t19 == null ?{core::Object} #t19 as{TypeError,ForNonNullableByDefault} core::Object : #t19{core::Object};
  objectVar = let final Never #t20 = 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' because 'XpotentiallyNull' is nullable and 'Object' isn't.
 - 'Object' is from 'dart:core'.
  objectVar = xPotentiallyNullArg;
              ^" in let self::error::XpotentiallyNull% #t21 = xPotentiallyNullArg in #t21 == null ?{core::Object} #t21 as{TypeError,ForNonNullableByDefault} core::Object : #t21{core::Object};
  objectVar = let final Never #t22 = 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' because 'XpotentiallyNull?' is nullable and 'Object' isn't.
 - 'Object' is from 'dart:core'.
  objectVar = xPotentiallyNullNullableArg;
              ^" in let self::error::XpotentiallyNull? #t23 = xPotentiallyNullNullableArg in #t23 == null ?{core::Object} #t23 as{TypeError,ForNonNullableByDefault} core::Object : #t23{core::Object};
  objectVar = let final Never #t24 = 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' because 'YnonNull?' is nullable and 'Object' isn't.
 - 'Object' is from 'dart:core'.
  objectVar = yNonNullNullableArg;
              ^" in let self::error::YnonNull? #t25 = yNonNullNullableArg in #t25 == null ?{core::Object} #t25 as{TypeError,ForNonNullableByDefault} core::Object : #t25{core::Object};
  objectVar = let final Never #t26 = 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' because 'YpotentiallyNull' is nullable and 'Object' isn't.
 - 'Object' is from 'dart:core'.
  objectVar = yPotentiallyNullArg;
              ^" in let self::error::YpotentiallyNull% #t27 = yPotentiallyNullArg in #t27 == null ?{core::Object} #t27 as{TypeError,ForNonNullableByDefault} core::Object : #t27{core::Object};
  objectVar = let final Never #t28 = 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' because 'YpotentiallyNull?' is nullable and 'Object' isn't.
 - 'Object' is from 'dart:core'.
  objectVar = yPotentiallyNullNullableArg;
              ^" in let self::error::YpotentiallyNull? #t29 = yPotentiallyNullNullableArg in #t29 == null ?{core::Object} #t29 as{TypeError,ForNonNullableByDefault} core::Object : #t29{core::Object};
  core::num numVar = let final Never #t30 = 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 Never #t31 = 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 Never #t32 = 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' because 'num?' is nullable and 'num' isn't.
  numVar = numNullableArg;
           ^" in let core::num? #t33 = numNullableArg in #t33 == null ?{core::num} #t33 as{TypeError,ForNonNullableByDefault} core::num : #t33{core::num};
  numVar = let final Never #t34 = 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' because 'int?' is nullable and 'num' isn't.
  numVar = intNullableArg;
           ^" in let core::int? #t35 = intNullableArg in #t35 == null ?{core::num} #t35 as{TypeError,ForNonNullableByDefault} core::num : #t35{core::num};
  numVar = let final Never #t36 = 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' because 'double?' is nullable and 'num' isn't.
  numVar = doubleNullableArg;
           ^" in let core::double? #t37 = doubleNullableArg in #t37 == null ?{core::num} #t37 as{TypeError,ForNonNullableByDefault} core::num : #t37{core::num};
  numVar = let final Never #t38 = 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 Never #t39 = 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 Never #t40 = 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 Never #t41 = 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 Never #t42 = 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 Never #t43 = 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 Never #t44 = 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 Never #t45 = 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 Never #t46 = 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 Never #t47 = 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 Never #t48 = 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 Never #t49 = 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 Never #t50 = 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 Never #t51 = 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 Never #t52 = 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 Never #t53 = 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 Never #t54 = 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 Never #t55 = 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 Never #t56 = 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' because 'int?' is nullable and 'int' isn't.
  intVar = intNullableArg;
           ^" in let core::int? #t57 = intNullableArg in #t57 == null ?{core::int} #t57 as{TypeError,ForNonNullableByDefault} core::int : #t57{core::int};
  intVar = let final Never #t58 = 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 Never #t59 = 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 Never #t60 = 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 Never #t61 = 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 Never #t62 = 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 Never #t63 = 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 Never #t64 = 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 Never #t65 = 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 Never #t66 = 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 Never #t67 = 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 Never #t68 = 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 Never #t69 = 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 Never #t70 = 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 Never #t71 = 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 Never #t72 = 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 Never #t73 = 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 Never #t74 = 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 Never #t75 = 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 Never #t76 = 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 Never #t77 = 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 Never #t78 = 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 Never #t79 = 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 Never #t80 = 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' because 'double?' is nullable and 'double' isn't.
  doubleVar = doubleNullableArg;
              ^" in let core::double? #t81 = doubleNullableArg in #t81 == null ?{core::double} #t81 as{TypeError,ForNonNullableByDefault} core::double : #t81{core::double};
  doubleVar = let final Never #t82 = 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 Never #t83 = 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 Never #t84 = 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 Never #t85 = 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 Never #t86 = 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 Never #t87 = 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 Never #t88 = 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 Never #t89 = 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 Never #t90 = 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 Never #t91 = 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 Never #t92 = 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 Never #t93 = 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 Never #t94 = 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 Never #t95 = 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 Never #t96 = 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 Never #t97 = 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 Never #t98 = 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 Never #t99 = 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 Never #t100 = 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 Never #t101 = 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 Never #t102 = 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 Never #t103 = 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 Never #t104 = 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' because 'Function?' is nullable and 'Function' isn't.
 - 'Function' is from 'dart:core'.
  functionVar = functionNullableArg;
                ^" in functionNullableArg as{TypeError,ForNonNullableByDefault} core::Function;
  functionVar = let final Never #t105 = 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' because 'void Function()?' is nullable and 'Function' isn't.
 - 'Function' is from 'dart:core'.
  functionVar = toVoidNullableArg;
                ^" in toVoidNullableArg as{TypeError,ForNonNullableByDefault} core::Function;
  functionVar = let final Never #t106 = 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 Never #t107 = 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 Never #t108 = 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 Never #t109 = 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 Never #t110 = 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 Never #t111 = 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 Never #t112 = 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 Never #t113 = 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 Never #t114 = 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 Never #t115 = 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 Never #t116 = 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 Never #t117 = 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 Never #t118 = 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 Never #t119 = 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 Never #t120 = 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 Never #t121 = 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 Never #t122 = 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 Never #t123 = 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 Never #t124 = 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 Never #t125 = 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()' because 'void Function()?' is nullable and 'void Function()' isn't.
  toVoidVar = toVoidNullableArg;
              ^" in let () →? void #t126 = toVoidNullableArg in #t126 == null ?{() → void} #t126 as{TypeError,ForNonNullableByDefault} () → void : #t126{() → void};
  toVoidVar = let final Never #t127 = 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 Never #t128 = 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 Never #t129 = 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 Never #t130 = 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 Never #t131 = 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 Never #t132 = 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 Never #t133 = 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 Never #t134 = 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 Never #t135 = 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 Never #t136 = 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 Never #t137 = 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 Never #t138 = 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 Never #t139 = 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 Never #t140 = 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 Never #t141 = 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 Never #t142 = 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 Never #t143 = 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 Never #t144 = 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 Never #t145 = 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 Never #t146 = 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 Never #t147 = 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 Never #t148 = 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' because 'Tearoffable?' is nullable and 'Tearoffable' isn't.
 - 'Tearoffable' is from 'pkg/front_end/testcases/nnbd/assignability.dart'.
  tearoffableVar = tearoffableNullableArg;
                   ^" in let self::Tearoffable? #t149 = tearoffableNullableArg in #t149 == null ?{self::Tearoffable} #t149 as{TypeError,ForNonNullableByDefault} self::Tearoffable : #t149{self::Tearoffable};
  tearoffableVar = let final Never #t150 = 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 Never #t151 = 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 Never #t152 = 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 Never #t153 = 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 Never #t154 = 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 Never #t155 = 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 Never #t156 = 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 Never #t157 = 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 Never #t158 = 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} Never;
  xNonNullVar = let final Never #t159 = 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} Never;
  xNonNullVar = let final Never #t160 = 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} Never;
  xNonNullVar = let final Never #t161 = 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} Never;
  xNonNullVar = let final Never #t162 = 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} Never;
  xNonNullVar = let final Never #t163 = 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} Never;
  xNonNullVar = let final Never #t164 = 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} Never;
  xNonNullVar = let final Never #t165 = 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} Never;
  xNonNullVar = let final Never #t166 = 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} Never;
  xNonNullVar = let final Never #t167 = 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} Never;
  xNonNullVar = let final Never #t168 = 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} Never;
  xNonNullVar = let final Never #t169 = 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} Never;
  xNonNullVar = let final Never #t170 = 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} Never;
  xNonNullVar = let final Never #t171 = 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} Never;
  xNonNullVar = let final Never #t172 = 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' because 'XnonNull?' is nullable and 'XnonNull' isn't.
  xNonNullVar = xNonNullNullableArg;
                ^" in xNonNullNullableArg as{TypeError,ForNonNullableByDefault} Never;
  xNonNullVar = let final Never #t173 = 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} Never;
  xNonNullVar = let final Never #t174 = 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} Never;
  xNonNullVar = let final Never #t175 = 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' because 'YnonNull?' is nullable and 'XnonNull' isn't.
  xNonNullVar = yNonNullNullableArg;
                ^" in yNonNullNullableArg as{TypeError,ForNonNullableByDefault} Never;
  xNonNullVar = let final Never #t176 = 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} Never;
  xNonNullVar = let final Never #t177 = 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} Never;
  self::error::XpotentiallyNull% xPotentiallyNullVar = let final Never #t178 = 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} Never;
  xPotentiallyNullVar = let final Never #t179 = 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} Never;
  xPotentiallyNullVar = let final Never #t180 = 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} Never;
  xPotentiallyNullVar = let final Never #t181 = 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} Never;
  xPotentiallyNullVar = let final Never #t182 = 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} Never;
  xPotentiallyNullVar = let final Never #t183 = 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} Never;
  xPotentiallyNullVar = let final Never #t184 = 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} Never;
  xPotentiallyNullVar = let final Never #t185 = 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} Never;
  xPotentiallyNullVar = let final Never #t186 = 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} Never;
  xPotentiallyNullVar = let final Never #t187 = 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} Never;
  xPotentiallyNullVar = let final Never #t188 = 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} Never;
  xPotentiallyNullVar = let final Never #t189 = 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} Never;
  xPotentiallyNullVar = let final Never #t190 = 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} Never;
  xPotentiallyNullVar = let final Never #t191 = 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} Never;
  xPotentiallyNullVar = let final Never #t192 = 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} Never;
  xPotentiallyNullVar = let final Never #t193 = 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} Never;
  xPotentiallyNullVar = let final Never #t194 = 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' because 'XpotentiallyNull?' is nullable and 'XpotentiallyNull' isn't.
  xPotentiallyNullVar = xPotentiallyNullNullableArg;
                        ^" in xPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} Never;
  xPotentiallyNullVar = let final Never #t195 = 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} Never;
  xPotentiallyNullVar = let final Never #t196 = 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} Never;
  xPotentiallyNullVar = let final Never #t197 = 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' because 'YpotentiallyNull?' is nullable and 'XpotentiallyNull' isn't.
  xPotentiallyNullVar = yPotentiallyNullNullableArg;
                        ^" in yPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} Never;
  self::error::YnonNull yNonNullVar = let final Never #t198 = 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} Never;
  yNonNullVar = let final Never #t199 = 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} Never;
  yNonNullVar = let final Never #t200 = 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} Never;
  yNonNullVar = let final Never #t201 = 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} Never;
  yNonNullVar = let final Never #t202 = 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} Never;
  yNonNullVar = let final Never #t203 = 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} Never;
  yNonNullVar = let final Never #t204 = 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} Never;
  yNonNullVar = let final Never #t205 = 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} Never;
  yNonNullVar = let final Never #t206 = 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} Never;
  yNonNullVar = let final Never #t207 = 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} Never;
  yNonNullVar = let final Never #t208 = 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} Never;
  yNonNullVar = let final Never #t209 = 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} Never;
  yNonNullVar = let final Never #t210 = 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} Never;
  yNonNullVar = let final Never #t211 = 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} Never;
  yNonNullVar = let final Never #t212 = 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} Never;
  yNonNullVar = let final Never #t213 = 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} Never;
  yNonNullVar = let final Never #t214 = 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} Never;
  yNonNullVar = let final Never #t215 = 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} Never;
  yNonNullVar = let final Never #t216 = 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' because 'YnonNull?' is nullable and 'YnonNull' isn't.
  yNonNullVar = yNonNullNullableArg;
                ^" in yNonNullNullableArg as{TypeError,ForNonNullableByDefault} Never;
  yNonNullVar = let final Never #t217 = 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} Never;
  yNonNullVar = let final Never #t218 = 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} Never;
  self::error::YpotentiallyNull% yPotentiallyNullVar = let final Never #t219 = 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} Never;
  yPotentiallyNullVar = let final Never #t220 = 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} Never;
  yPotentiallyNullVar = let final Never #t221 = 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} Never;
  yPotentiallyNullVar = let final Never #t222 = 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} Never;
  yPotentiallyNullVar = let final Never #t223 = 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} Never;
  yPotentiallyNullVar = let final Never #t224 = 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} Never;
  yPotentiallyNullVar = let final Never #t225 = 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} Never;
  yPotentiallyNullVar = let final Never #t226 = 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} Never;
  yPotentiallyNullVar = let final Never #t227 = 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} Never;
  yPotentiallyNullVar = let final Never #t228 = 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} Never;
  yPotentiallyNullVar = let final Never #t229 = 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} Never;
  yPotentiallyNullVar = let final Never #t230 = 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} Never;
  yPotentiallyNullVar = let final Never #t231 = 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} Never;
  yPotentiallyNullVar = let final Never #t232 = 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} Never;
  yPotentiallyNullVar = let final Never #t233 = 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} Never;
  yPotentiallyNullVar = let final Never #t234 = 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} Never;
  yPotentiallyNullVar = let final Never #t235 = 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} Never;
  yPotentiallyNullVar = let final Never #t236 = 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} Never;
  yPotentiallyNullVar = let final Never #t237 = 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} Never;
  yPotentiallyNullVar = let final Never #t238 = 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} Never;
  yPotentiallyNullVar = let final Never #t239 = 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' because 'YpotentiallyNull?' is nullable and 'YpotentiallyNull' isn't.
  yPotentiallyNullVar = yPotentiallyNullNullableArg;
                        ^" in yPotentiallyNullNullableArg as{TypeError,ForNonNullableByDefault} Never;
}
static method main() → dynamic {}