library /*isNonNullableByDefault*/;
//
// Problems in library:
//
// pkg/front_end/testcases/nnbd/call.dart:12:4: Error: Can't use an expression of type 'void Function()?' as a function because it's potentially null.
// Try calling using ?.call instead.
//   f();
//    ^
//
// pkg/front_end/testcases/nnbd/call.dart:13:5: Error: Method 'call' cannot be called on 'void Function()?' because it is potentially null.
// Try calling using ?. instead.
//   f.call();
//     ^^^^
//
// pkg/front_end/testcases/nnbd/call.dart:15:10: Error: Can't use an expression of type 'void Function()?' as a function because it's potentially null.
// Try calling using ?.call instead.
//   c.field();
//          ^
//
// pkg/front_end/testcases/nnbd/call.dart:16:11: Error: Can't use an expression of type 'void Function()?' as a function because it's potentially null.
// Try calling using ?.call instead.
//   c.getter();
//           ^
//
import self as self;
import "dart:core" as core;

class Class extends core::Object {
  field () →? void field = null;
  synthetic constructor •() → self::Class
    : super core::Object::•()
    ;
  get getter() → () →? void
    return null;
}
static method error() → dynamic {
  () →? void f;
  invalid-expression "pkg/front_end/testcases/nnbd/call.dart:12:4: Error: Can't use an expression of type 'void Function()?' as a function because it's potentially null.
Try calling using ?.call instead.
  f();
   ^" in f{<nullable>}.(){() →? void};
  invalid-expression "pkg/front_end/testcases/nnbd/call.dart:13:5: Error: Method 'call' cannot be called on 'void Function()?' because it is potentially null.
Try calling using ?. instead.
  f.call();
    ^^^^" in f{<nullable>}.(){() →? void};
  self::Class c = new self::Class::•();
  invalid-expression "pkg/front_end/testcases/nnbd/call.dart:15:10: Error: Can't use an expression of type 'void Function()?' as a function because it's potentially null.
Try calling using ?.call instead.
  c.field();
         ^" in c.{self::Class::field}{() →? void}{<nullable>}.(){() →? void};
  invalid-expression "pkg/front_end/testcases/nnbd/call.dart:16:11: Error: Can't use an expression of type 'void Function()?' as a function because it's potentially null.
Try calling using ?.call instead.
  c.getter();
          ^" in c.{self::Class::getter}{() →? void}{<nullable>}.(){() →? void};
}
static method main() → dynamic {}