==== tests/cases/compiler/numericIndexerConstraint1.ts (1 errors) ====
    class Foo { foo() { } }
    var x: { [index: string]: number; };
    var result: Foo = x["one"]; // error
        ~~~~~~
!!! Type 'number' is not assignable to type 'Foo':
!!!   Property 'foo' is missing in type 'Number'.