[analyzer] No error if an extension type declares getter and setter with the same basename but with uncompatible types

[sgrekhov]

Analyzer doesn't report an error if an extension type declares an instance getter and setter with incompatible types.
For example the following errors are not reported.

extension type ET1(int id) {
  void set x(String i) {}
  int get x => 42;
//        ^
// [analyzer] unspecified
// [cfe] unspecified   
}

extension type ET2(int id) {
  void set id(String i) {} // conflict with the type of representation variable getter
//         ^^
// [analyzer] unspecified
// [cfe] unspecified
}

cc @eernstg to confirm that extension type should behave like a regular class here
Tested on the edge SDK (Sept 11, 2023) on Linux x64

[eernstg]

Yes, that error should be reported.

Cf. dart-lang/language#3338.

[scheglov]

This was fixed in 08c0108.