Parser/Resolver problem with `is` on method declaration

[FMorschel]

Repro:

class A {
  bool myMethod(bool value) {
    return value;
  }

  bool isGetter { // This is being parsed as a method with synthetic `()`
    
  }

  void foo() {
    print('');
  }

  int get myGetter {
    return 42;
  }
}

Now at isGetter separate is with a whitespace. See many different diagnostics even above this.

Note that if the return type is void, this doesn't happen.

I'm not sure what else I could do to help here, but please let me know if I can do anything else.

CC @bwilkerson