=== tests/cases/compiler/indexClassByNumber.ts ===
// Shouldn't be able to index a class instance by a number (unless it has declared a number index signature)

class foo { }
>foo : foo

var f = new foo();
>f : foo
>new foo() : foo
>foo : typeof foo

f[0] = 4; // Shouldn't be allowed
>f[0] = 4 : number
>f[0] : any
>f : foo
>0 : number
>4 : number