==== tests/cases/compiler/interfaceMemberValidation.ts (3 errors) ====
    interface i1 { name: string; }
    interface i2 extends i1 { name: number; yo: string; }
              ~~
!!! Interface 'i2' incorrectly extends interface 'i1':
!!!   Types of property 'name' are incompatible:
!!!     Type 'number' is not assignable to type 'string'.
    
    interface foo {
     bar():any;
     ~~~~~~~~~~
!!! Property 'bar' of type '{ (): any; (): any; }' is not assignable to string index type 'number'.
     bar():any;
     new():void;
     new():void;
     [s:string]:number;
     [s:string]:number;
     ~~~~~~~~~~~~~~~~~~
!!! Duplicate string index signature.
    }