library /*isNonNullableByDefault*/;
import self as self;
import "dart:core" as core;
import "dart:async" as asy;

static method main() → dynamic async {
  core::bool b = (() → core::bool => true)(){() → core::bool};
  (dynamic _) → core::int? {
    if(b)
      return 42;
  };
  (dynamic _) → asy::Future<core::int?> async {
    if(b)
      return 42;
  };
}