library;
//
// Problems in library:
//
// pkg/front_end/testcases/extensions/issue38712.dart:5:11: Error: Expected 'on' after this.
// extension C {
//           ^
//
// pkg/front_end/testcases/extensions/issue38712.dart:5:13: Error: Expected a type, but got '{'.
// extension C {
//             ^
//
import self as self;

extension C on invalid-type {
}
static method main() → void {}