==== tests/cases/compiler/interfaceDeclaration4.ts (6 errors) ====
    // Import this module when test harness supports external modules. Also remove the internal module below.
    // import Foo = require("interfaceDeclaration5")
    module Foo {
        export interface I1 { item: string; }
        export class C1 { }
    }
    
    class C1 implements Foo.I1 {
    	public item:string;
    }
    
    // Allowed
    interface I2 extends Foo.I1 {
    	item:string;
    }
    
    // Negative Case
    interface I3 extends Foo.I1 {
              ~~
!!! Interface 'I3' incorrectly extends interface 'I1':
!!!   Types of property 'item' are incompatible:
!!!     Type 'number' is not assignable to type 'string'.
        item:number;
    }
    
    interface I4 extends Foo.I1 {
        token:string;
    }
    
    // Err - not implemented item
    class C2 implements I4 {
          ~~
!!! Class 'C2' incorrectly implements interface 'I4':
!!!   Property 'item' is missing in type 'C2'.
        public token: string;
    }
    
    interface I5 extends Foo { }
    
    // Negative case
    interface I6 extends Foo.C1 { }
    
    class C3 implements Foo.I1 { }
          ~~
!!! Class 'C3' incorrectly implements interface 'I1':
!!!   Property 'item' is missing in type 'C3'.
    
    // Negative case 
    interface Foo.I1 { }
                 ~
!!! '{' expected.
                     ~
!!! ';' expected.
                  ~~
!!! Cannot find name 'I1'.