[Augmentation] Wrong error in the analyzer when augmenting a factory constructor

[sgrekhov]

class C {
  C();
  factory C.foo() = C;
}

augment class C {
  augment C();
  augment factory C.foo(); // Errors, see below
}

main() {
  print(C);
}

Analyzer (with --enable-experiment=macros) produces two errors here.

  error • augmenting_constructors_A03_t04.dart:54:19 • The constructor with name 'foo' is already defined. Try renaming one of the constructors. • duplicate_constructor
  error • augmenting_constructors_A03_t04.dart:54:26 • A function body must be provided. Try adding a function body. • missing_function_body

If to update the test and to remove the factory keyword from the augmentation then the error disappears.

class C {
  C();
  factory C.foo() = C;
}

augment class C {
  augment C();
  augment C.foo(); // Ok, no error
}

Dart SDK version: 3.7.0-86.0.dev (dev) (Wed Oct 30 17:03:22 2024 -0700) on "windows_x64"