==== tests/cases/compiler/objectLiteralIndexerErrors.ts (1 errors) ====
    interface A {
        x: number;
    }
    
    interface B extends A {
        y: string;
    }
    
    var a: A;
    var b: B;
    var c: any;
    
    var o1: { [s: string]: A;[n: number]: B; } = { x: b, 0: a }; // both indexers are A
        ~~
!!! Type '{ [x: string]: A; [x: number]: A; 0: A; x: B; }' is not assignable to type '{ [x: string]: A; [x: number]: B; }':
!!!   Index signatures are incompatible:
!!!     Type 'A' is not assignable to type 'B':
!!!       Property 'y' is missing in type 'A'.
    o1 = { x: c, 0: a }; // string indexer is any, number indexer is A