library /*isNonNullableByDefault*/;
//
// Problems in library:
//
// pkg/front_end/testcases/general/extension_types_feature_not_enabled.dart:9:11: Error: This requires the experimental 'extension-types' language feature to be enabled.
// Try passing the '--enable-experiment=extension-types' command line option.
// extension type E on A {} // Error because of 'type'.
//           ^^^^
//
import self as self;
import "dart:core" as core;

class A extends core::Object {
  synthetic constructor •() → self::A
    ;
}
extension type E on self::A {
}
static method main() → dynamic
  ;