[Enhanced enums] CFE reports wrong setter/getter signature error

[sgrekhov]

The following co19 test fails on CFE https://github.com/dart-lang/co19/blob/master/LanguageFeatures/Enhanced-Enum/semantics_A09_t10.dart

import "../../Utils/expect.dart";

enum E1 {
  e1,
  e2,
  e3;

  static void set e1(E1 val) {
    Expect.equals(E1.e2, val);
  }
}

enum E2<T> {
  e1<int>(42),
  e2<String>("42"),
  e3<bool>(false);

  const E2(T t);
  static void set e1(E2<int> val) {
    Expect.equals(E2.e1, val);
  }
  static void set e2(E2<String> val) {
    Expect.equals(E2.e2, val);
  }
  static void set e3(E2<bool> val) {
    Expect.equals(E2.e3, val);
  }
}

main() {
  E1.e1 = E1.e2;
  E2.e1 = E2.e1;
  E2.e2 = E2.e2;
  E2.e3 = E2.e3;
}

The type of E2.e1 is considered to be E2<dynamic>, but it should be E2<int>, so there should not be a setter/getter
signature error

Tested on Dart SDK version: 2.17.0-edge.5e8e68c2c86983f8f4bc856e3ad5092db4d65f6c (be) (Thu Feb 3 01:08:34 2022 +0000) on "linux_x64"

[chloestefantsova]

Fixed in https://dart-review.googlesource.com/c/sdk/+/236000.