library /*isNonNullableByDefault*/;
//
// Problems in library:
//
// pkg/front_end/testcases/nnbd/null_access.dart:24:3: Error: Operator 'unary-' cannot be called on 'int?' because it is potentially null.
//   -nullableInt; // error
//   ^
//
// pkg/front_end/testcases/nnbd/null_access.dart:25:15: Error: Operator '+' cannot be called on 'int?' because it is potentially null.
//   nullableInt + 2; // error
//               ^
//
// pkg/front_end/testcases/nnbd/null_access.dart:26:16: Error: Operator '[]' cannot be called on 'Class?' because it is potentially null.
//  - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
//   nullableClass[nonNullableInt]; // error
//                ^
//
// pkg/front_end/testcases/nnbd/null_access.dart:27:16: Error: Operator '[]=' cannot be called on 'Class?' because it is potentially null.
//  - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
//   nullableClass[nonNullableInt] = nonNullableInt; // error
//                ^
//
// pkg/front_end/testcases/nnbd/null_access.dart:28:16: Error: Operator '[]' cannot be called on 'Class?' because it is potentially null.
//  - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
//   nullableClass[nonNullableInt] += nonNullableInt; // error
//                ^
//
// pkg/front_end/testcases/nnbd/null_access.dart:28:16: Error: Operator '[]=' cannot be called on 'Class?' because it is potentially null.
//  - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
//   nullableClass[nonNullableInt] += nonNullableInt; // error
//                ^
//
// pkg/front_end/testcases/nnbd/null_access.dart:29:29: Error: Operator '[]' cannot be called on 'NullableIndexClass?' because it is potentially null.
//  - 'NullableIndexClass' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
//   nullableNullableIndexClass[nonNullableInt] ??= nonNullableInt; // error
//                             ^
//
// pkg/front_end/testcases/nnbd/null_access.dart:29:29: Error: Operator '[]=' cannot be called on 'NullableIndexClass?' because it is potentially null.
//  - 'NullableIndexClass' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
//   nullableNullableIndexClass[nonNullableInt] ??= nonNullableInt; // error
//                             ^
//
// pkg/front_end/testcases/nnbd/null_access.dart:37:17: Error: Property 'nonNullableField' cannot be accessed on 'Class?' because it is potentially null.
//  - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
// Try accessing using ?. instead.
//   nullableClass.nonNullableField; // error
//                 ^^^^^^^^^^^^^^^^
//
// pkg/front_end/testcases/nnbd/null_access.dart:38:17: Error: Property 'nonNullableField' cannot be accessed on 'Class?' because it is potentially null.
//  - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
// Try accessing using ?. instead.
//   nullableClass.nonNullableField = 2; // error
//                 ^^^^^^^^^^^^^^^^
//
// pkg/front_end/testcases/nnbd/null_access.dart:39:17: Error: Property 'nonNullableField' cannot be accessed on 'Class?' because it is potentially null.
//  - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
// Try accessing using ?. instead.
//   nullableClass.nonNullableField += 2; // error
//                 ^^^^^^^^^^^^^^^^
//
// pkg/front_end/testcases/nnbd/null_access.dart:48:34: Error: Operator '+' cannot be called on 'int?' because it is potentially null.
//   nonNullableClass.nullableField += 2; // error
//                                  ^
//
// pkg/front_end/testcases/nnbd/null_access.dart:48:34: Error: A value of type 'num' can't be assigned to a variable of type 'int?'.
//   nonNullableClass.nullableField += 2; // error
//                                  ^
//
// pkg/front_end/testcases/nnbd/null_access.dart:49:32: Error: Operator '+' cannot be called on 'int?' because it is potentially null.
//   nullableClass?.nullableField += 2; // error
//                                ^
//
// pkg/front_end/testcases/nnbd/null_access.dart:49:32: Error: A value of type 'num' can't be assigned to a variable of type 'int?'.
//   nullableClass?.nullableField += 2; // error
//                                ^
//
// pkg/front_end/testcases/nnbd/null_access.dart:54:35: Warning: Operand of null-aware operation '??=' has type 'int' which excludes null.
//   nullableClass?.nonNullableClass.nonNullableField ??= 0; // ok
//                                   ^
//
// pkg/front_end/testcases/nnbd/null_access.dart:57:16: Error: Can't use an expression of type 'Class?' as a function because it's potentially null.
//  - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
// Try calling using ?.call instead.
//   nullableClass(); // error
//                ^
//
// pkg/front_end/testcases/nnbd/null_access.dart:59:3: Warning: Operand of null-aware operation '?.' has type 'Class' which excludes null.
//  - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
//   nonNullableClass?.nonNullableClass(); // ok
//   ^
//
// pkg/front_end/testcases/nnbd/null_access.dart:60:3: Warning: Operand of null-aware operation '?.' has type 'Class' which excludes null.
//  - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
//   nonNullableClass?.nonNullableClass.nonNullableClass(); // ok
//   ^
//
import self as self;
import "dart:core" as core;

class Class extends core::Object {
  field core::int nonNullableField = 0;
  field core::int? nullableField = null;
  synthetic constructor •() → self::Class
    : super core::Object::•()
    ;
  operator [](core::int key) → core::int
    return key;
  operator []=(core::int key, core::int value) → void {}
  get nonNullableClass() → self::Class
    return this;
  method call() → self::Class
    return this;
  get nonNullableNullableIndexClass() → self::NullableIndexClass
    return new self::NullableIndexClass::•();
}
class NullableIndexClass extends core::Object {
  synthetic constructor •() → self::NullableIndexClass
    : super core::Object::•()
    ;
  operator [](core::int key) → core::int?
    return key;
  operator []=(core::int key, core::int value) → void {}
}
static method main() → dynamic {}
static method errors(self::Class? nullableClass, self::Class nonNullableClass, core::int? nullableInt, core::int nonNullableInt, self::NullableIndexClass? nullableNullableIndexClass) → dynamic {
  invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:24:3: Error: Operator 'unary-' cannot be called on 'int?' because it is potentially null.
  -nullableInt; // error
  ^" in nullableInt.{core::int::unary-}(){() → core::int};
  invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:25:15: Error: Operator '+' cannot be called on 'int?' because it is potentially null.
  nullableInt + 2; // error
              ^" in nullableInt.{core::num::+}(2){(core::num) → core::num};
  invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:26:16: Error: Operator '[]' cannot be called on 'Class?' because it is potentially null.
 - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
  nullableClass[nonNullableInt]; // error
               ^" in nullableClass.{self::Class::[]}{<nullable>}.(nonNullableInt){(core::int) → core::int};
  invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:27:16: Error: Operator '[]=' cannot be called on 'Class?' because it is potentially null.
 - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
  nullableClass[nonNullableInt] = nonNullableInt; // error
               ^" in nullableClass.{self::Class::[]=}{<nullable>}.(nonNullableInt, nonNullableInt){(core::int, core::int) → void};
  let final self::Class? #t1 = nullableClass in let final core::int #t2 = nonNullableInt in invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:28:16: Error: Operator '[]=' cannot be called on 'Class?' because it is potentially null.
 - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
  nullableClass[nonNullableInt] += nonNullableInt; // error
               ^" in #t1.{self::Class::[]=}{<nullable>}.(#t2, invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:28:16: Error: Operator '[]' cannot be called on 'Class?' because it is potentially null.
 - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
  nullableClass[nonNullableInt] += nonNullableInt; // error
               ^" in #t1.{self::Class::[]}{<nullable>}.(#t2){(core::int) → core::int}.{core::num::+}(nonNullableInt){(core::num) → core::int}){(core::int, core::int) → void};
  let final self::NullableIndexClass? #t3 = nullableNullableIndexClass in let final core::int #t4 = nonNullableInt in invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:29:29: Error: Operator '[]' cannot be called on 'NullableIndexClass?' because it is potentially null.
 - 'NullableIndexClass' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
  nullableNullableIndexClass[nonNullableInt] ??= nonNullableInt; // error
                            ^" in #t3.{self::NullableIndexClass::[]}{<nullable>}.(#t4){(core::int) → core::int?} == null ?{core::int} invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:29:29: Error: Operator '[]=' cannot be called on 'NullableIndexClass?' because it is potentially null.
 - 'NullableIndexClass' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
  nullableNullableIndexClass[nonNullableInt] ??= nonNullableInt; // error
                            ^" in #t3.{self::NullableIndexClass::[]=}{<nullable>}.(#t4, nonNullableInt){(core::int, core::int) → void} : null;
  let final self::Class? #t5 = nullableClass in #t5 == null ?{core::int?} null : #t5{self::Class}.{self::Class::nonNullableClass}{self::Class}.{self::Class::[]}(nonNullableInt){(core::int) → core::int};
  let final self::Class? #t6 = nullableClass in #t6 == null ?{core::int?} null : #t6{self::Class}.{self::Class::nonNullableClass}{self::Class}.{self::Class::[]=}(nonNullableInt, nonNullableInt){(core::int, core::int) → void};
  let final self::Class? #t7 = nullableClass in #t7 == null ?{core::int?} null : let final self::Class #t8 = #t7{self::Class}.{self::Class::nonNullableClass}{self::Class} in let final core::int #t9 = nonNullableInt in #t8.{self::Class::[]=}(#t9, #t8.{self::Class::[]}(#t9){(core::int) → core::int}.{core::num::+}(nonNullableInt){(core::num) → core::int}){(core::int, core::int) → void};
  let final self::Class? #t10 = nullableClass in #t10 == null ?{core::int?} null : let final self::NullableIndexClass #t11 = #t10{self::Class}.{self::Class::nonNullableNullableIndexClass}{self::NullableIndexClass} in let final core::int #t12 = nonNullableInt in #t11.{self::NullableIndexClass::[]}(#t12){(core::int) → core::int?} == null ?{core::int} #t11.{self::NullableIndexClass::[]=}(#t12, nonNullableInt){(core::int, core::int) → void} : null;
  invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:37:17: Error: Property 'nonNullableField' cannot be accessed on 'Class?' because it is potentially null.
 - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
Try accessing using ?. instead.
  nullableClass.nonNullableField; // error
                ^^^^^^^^^^^^^^^^" in nullableClass.{self::Class::nonNullableField}{<nullable>}.{core::int};
  invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:38:17: Error: Property 'nonNullableField' cannot be accessed on 'Class?' because it is potentially null.
 - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
Try accessing using ?. instead.
  nullableClass.nonNullableField = 2; // error
                ^^^^^^^^^^^^^^^^" in nullableClass.{self::Class::nonNullableField}{<nullable>}. = 2;
  let final self::Class? #t13 = nullableClass in invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:39:17: Error: Property 'nonNullableField' cannot be accessed on 'Class?' because it is potentially null.
 - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
Try accessing using ?. instead.
  nullableClass.nonNullableField += 2; // error
                ^^^^^^^^^^^^^^^^" in #t13.{self::Class::nonNullableField}{<nullable>}. = invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:39:17: Error: Property 'nonNullableField' cannot be accessed on 'Class?' because it is potentially null.
 - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
Try accessing using ?. instead.
  nullableClass.nonNullableField += 2; // error
                ^^^^^^^^^^^^^^^^" in #t13.{self::Class::nonNullableField}{<nullable>}.{core::int}.{core::num::+}(2){(core::num) → core::int};
  let final self::Class? #t14 = nullableClass in #t14 == null ?{core::int?} null : #t14{self::Class}.{self::Class::nonNullableField}{core::int};
  let final self::Class? #t15 = nullableClass in #t15 == null ?{core::int?} null : #t15{self::Class}.{self::Class::nonNullableField} = 2;
  let final self::Class? #t16 = nullableClass in #t16 == null ?{core::int?} null : #t16.{self::Class::nonNullableField} = #t16.{self::Class::nonNullableField}{core::int}.{core::num::+}(2){(core::num) → core::int};
  let final self::Class? #t17 = nullableClass in #t17 == null ?{core::int?} null : #t17{self::Class}.{self::Class::nonNullableClass}{self::Class}.{self::Class::nonNullableField}{core::int};
  let final self::Class? #t18 = nullableClass in #t18 == null ?{core::int?} null : #t18{self::Class}.{self::Class::nonNullableClass}{self::Class}.{self::Class::nonNullableField} = 2;
  let final self::Class #t19 = nonNullableClass in #t19.{self::Class::nullableField} = invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:48:34: Error: A value of type 'num' can't be assigned to a variable of type 'int?'.
  nonNullableClass.nullableField += 2; // error
                                 ^" in invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:48:34: Error: Operator '+' cannot be called on 'int?' because it is potentially null.
  nonNullableClass.nullableField += 2; // error
                                 ^" in #t19.{self::Class::nullableField}{core::int?}.{core::num::+}(2){(core::num) → core::num};
  let final self::Class? #t20 = nullableClass in #t20 == null ?{core::num?} null : #t20.{self::Class::nullableField} = invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:49:32: Error: A value of type 'num' can't be assigned to a variable of type 'int?'.
  nullableClass?.nullableField += 2; // error
                               ^" in invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:49:32: Error: Operator '+' cannot be called on 'int?' because it is potentially null.
  nullableClass?.nullableField += 2; // error
                               ^" in #t20.{self::Class::nullableField}{core::int?}.{core::num::+}(2){(core::num) → core::num};
  let final self::Class? #t21 = nullableClass in #t21 == null ?{core::int?} null : #t21.{self::Class::nonNullableField}{core::int} == null ?{core::int} #t21.{self::Class::nonNullableField} = 0 : null;
  let final self::Class? #t22 = nullableClass in #t22 == null ?{core::int?} null : #t22.{self::Class::nullableField}{core::int?} == null ?{core::int} #t22.{self::Class::nullableField} = 0 : null;
  let final self::Class? #t23 = nullableClass in #t23 == null ?{core::int?} null : let final self::Class #t24 = #t23{self::Class}.{self::Class::nonNullableClass}{self::Class} in #t24.{self::Class::nonNullableField}{core::int} == null ?{core::int} #t24.{self::Class::nonNullableField} = 0 : null;
  let final self::Class? #t25 = nullableClass in #t25 == null ?{core::int?} null : let final self::Class #t26 = #t25{self::Class}.{self::Class::nonNullableClass}{self::Class} in #t26.{self::Class::nullableField}{core::int?} == null ?{core::int} #t26.{self::Class::nullableField} = 0 : null;
  invalid-expression "pkg/front_end/testcases/nnbd/null_access.dart:57:16: Error: Can't use an expression of type 'Class?' as a function because it's potentially null.
 - 'Class' is from 'pkg/front_end/testcases/nnbd/null_access.dart'.
Try calling using ?.call instead.
  nullableClass(); // error
               ^" in nullableClass.{self::Class::call}{<nullable>}.(){() → self::Class};
  nonNullableClass.{self::Class::call}(){() → self::Class};
  let final self::Class #t27 = nonNullableClass in #t27 == null ?{self::Class?} null : #t27.{self::Class::nonNullableClass}{self::Class}.{self::Class::call}(){() → self::Class};
  let final self::Class #t28 = nonNullableClass in #t28 == null ?{self::Class?} null : #t28.{self::Class::nonNullableClass}{self::Class}.{self::Class::nonNullableClass}{self::Class}.{self::Class::call}(){() → self::Class};
}