==== tests/cases/compiler/indexerAssignability.ts (3 errors) ====
    var a: { [s: string]: string; };
    var b: { [n: number]: string; };
    var c: {};
    
    a = b;
    ~
!!! indexerAssignability.ts(5,1): error TS2012: Cannot convert '{ [n: number]: string; }' to '{ [s: string]: string; }':
!!! 	Index signatures of types '{ [n: number]: string; }' and '{ [s: string]: string; }' are incompatible.
    a = c;
    ~
!!! indexerAssignability.ts(6,1): error TS2012: Cannot convert '{}' to '{ [s: string]: string; }':
!!! 	Index signatures of types '{}' and '{ [s: string]: string; }' are incompatible.
    b = a;
    b = c;
    ~
!!! indexerAssignability.ts(8,1): error TS2012: Cannot convert '{}' to '{ [n: number]: string; }':
!!! 	Index signatures of types '{}' and '{ [n: number]: string; }' are incompatible.
    c = a;
    c = b;