==== tests/cases/compiler/assignmentCompatWithNumericIndexer3.ts (3 errors) ====
    // Derived type indexer must be subtype of base type indexer
    
    interface Base { foo: string; }
    interface Derived extends Base { bar: string; }
    interface Derived2 extends Derived { baz: string; }
    
    class A {
        [x: number]: Derived;
    }
    
    var a: A;
    var b: { [x: number]: Base; };
    
    a = b; // error
    ~
!!! assignmentCompatWithNumericIndexer3.ts(14,1): error TS2012: Cannot convert '{ [x: number]: Base; }' to 'A':
!!! 	Index signatures of types '{ [x: number]: Base; }' and 'A' are incompatible:
!!! 		Type 'Base' is missing property 'bar' from type 'Derived'.
    b = a; // ok
    
    class B2 extends A {
        [x: number]: Derived2; // ok
    }
    
    var b2: { [x: number]: Derived2; };
    a = b2; // ok
    b2 = a; // error
    ~~
!!! assignmentCompatWithNumericIndexer3.ts(23,1): error TS2012: Cannot convert 'A' to '{ [x: number]: Derived2; }':
!!! 	Index signatures of types 'A' and '{ [x: number]: Derived2; }' are incompatible:
!!! 		Type 'Derived' is missing property 'baz' from type 'Derived2'.
    
    module Generics {
        class A<T extends Derived> {
            [x: number]: T;
        }
    
        function foo<T extends Derived>() {
            var a: A<T>;
            var b: { [x: number]: Derived; };
            a = b; // error
            ~
!!! assignmentCompatWithNumericIndexer3.ts(33,9): error TS2012: Cannot convert '{ [x: number]: Derived; }' to 'A<T>':
!!! 	Index signatures of types '{ [x: number]: Derived; }' and 'A<T>' are incompatible.
            b = a; // ok
    
            var b2: { [x: number]: T; };
            a = b2; // ok
            b2 = a; // ok
        }
    }