library;
//
// Problems in library:
//
// pkg/front_end/testcases/extensions/extension_field_with_type_parameter_usage.dart:6:5: Error: Extensions can't declare instance fields
// Try removing the field declaration or making it a static field
//   U field1 = null;
//     ^^^^^^
//
// pkg/front_end/testcases/extensions/extension_field_with_type_parameter_usage.dart:7:7: Error: Extensions can't declare instance fields
// Try removing the field declaration or making it a static field
//   int field2 = () { U x = null; return null; }();
//       ^^^^^^
//
// pkg/front_end/testcases/extensions/extension_field_with_type_parameter_usage.dart:8:11: Error: Extensions can't declare instance fields
// Try removing the field declaration or making it a static field
//   List<U> field3 = null;
//           ^^^^^^
//
// pkg/front_end/testcases/extensions/extension_field_with_type_parameter_usage.dart:9:17: Error: Extensions can't declare instance fields
// Try removing the field declaration or making it a static field
//   U Function(U) field4 = null;
//                 ^^^^^^
//
// pkg/front_end/testcases/extensions/extension_field_with_type_parameter_usage.dart:10:29: Error: Extensions can't declare instance fields
// Try removing the field declaration or making it a static field
//   List<U> Function(List<U>) field5 = null;
//                             ^^^^^^
//
// pkg/front_end/testcases/extensions/extension_field_with_type_parameter_usage.dart:11:7: Error: Extensions can't declare instance fields
// Try removing the field declaration or making it a static field
//   int field6 = <E>() { E x = null; return null; }<String>();
//       ^^^^^^
//
// pkg/front_end/testcases/extensions/extension_field_with_type_parameter_usage.dart:12:7: Error: Extensions can't declare instance fields
// Try removing the field declaration or making it a static field
//   int field7 = <E>() { E x = null; return null; }<U>();
//       ^^^^^^
//
// pkg/front_end/testcases/extensions/extension_field_with_type_parameter_usage.dart:6:3: Error: Type variables can't be used in static members.
//   U field1 = null;
//   ^
//
// pkg/front_end/testcases/extensions/extension_field_with_type_parameter_usage.dart:8:8: Error: Type variables can't be used in static members.
//   List<U> field3 = null;
//        ^
//
// pkg/front_end/testcases/extensions/extension_field_with_type_parameter_usage.dart:9:3: Error: Type variables can't be used in static members.
//   U Function(U) field4 = null;
//   ^
//
// pkg/front_end/testcases/extensions/extension_field_with_type_parameter_usage.dart:9:14: Error: Type variables can't be used in static members.
//   U Function(U) field4 = null;
//              ^
//
// pkg/front_end/testcases/extensions/extension_field_with_type_parameter_usage.dart:10:8: Error: Type variables can't be used in static members.
//   List<U> Function(List<U>) field5 = null;
//        ^
//
// pkg/front_end/testcases/extensions/extension_field_with_type_parameter_usage.dart:10:25: Error: Type variables can't be used in static members.
//   List<U> Function(List<U>) field5 = null;
//                         ^
//
import self as self;
import "dart:core" as core;

extension E<U extends core::Object* = dynamic> on core::String* {
  field field1 = self::E|field1;
  field field2 = self::E|field2;
  field field3 = self::E|field3;
  field field4 = self::E|field4;
  field field5 = self::E|field5;
  field field6 = self::E|field6;
  field field7 = self::E|field7;
}
static field invalid-type E|field1;
static field core::int* E|field2;
static field core::List<invalid-type>* E|field3;
static field (invalid-type) →* invalid-type E|field4;
static field (core::List<invalid-type>*) →* core::List<invalid-type>* E|field5;
static field core::int* E|field6;
static field core::int* E|field7;
static method main() → dynamic
  ;