=== tests/cases/conformance/types/typeRelationships/subtypesAndSuperTypes/subtypingWithCallSignaturesA.ts ===
declare function foo3(cb: (x: number) => number): typeof cb;
>foo3 : (cb: (x: number) => number) => typeof cb
>cb : (x: number) => number
>x : number
>cb : (x: number) => number

var r5 = foo3((x: number) => ''); // error
>r5 : (x: number) => number
>foo3((x: number) => '') : (x: number) => number
>foo3 : (cb: (x: number) => number) => (x: number) => number
>(x: number) => '' : (x: number) => string
>x : number
>'' : ""