Code like this:

class A {}

class B {
  A _a;
  A get a => _a;
  set A(A a) => _a = a;
}

gives error:

Error: 'A' isn't a type.
  A _a;

which is a little confusing, as the type is clearly defined above. It took me a long while to find out what is the actual issue (I first thought incorrect import / conflicting names imported).

It also causes analyzer to highlight all the places except where the actual problem is: