tests/cases/compiler/interfaceDeclaration6.ts(3,11): error TS2430: Interface 'i3' incorrectly extends interface 'i1'.
  Types of property 'foo' are incompatible.
    Type 'string' is not assignable to type 'number'.


==== tests/cases/compiler/interfaceDeclaration6.ts (1 errors) ====
    interface i1 { foo: number; };
    interface i2 extends i1 { foo: number; };
    interface i3 extends i1 { foo: string; };
              ~~
!!! error TS2430: Interface 'i3' incorrectly extends interface 'i1'.
!!! error TS2430:   Types of property 'foo' are incompatible.
!!! error TS2430:     Type 'string' is not assignable to type 'number'.
    interface i4 {
     bar():any;
     bar():any;
    }