Error messages are vague when types have same name

[DanielRosenwasser]

Found through @LPGhatguy on Gitter at January 3, 2016 10:09 PM.

Seems like #1419 didn't have enough coverage. Try out the following:

• m1.ts

  export interface A { a1; }

• m2.ts

  export interface A { a2; }

• m3.ts

  import * as m1 from "./m1";
  import * as m2 from "./m2";
  
  let x: m1.A;
  let y: m2.A;
  
  x = y;
  x === y;

Error messages:

Type 'A' is not assignable to type 'A'.
  Property 'a1' is missing in type 'A'.

Operator '===' cannot be applied to types 'A' and 'A'.

This is the worst error message you can give to a user.