TypeScript Version: nightly (Version 2.5.0-dev.20170801)

Code

declare function f(n: number): void;
declare function f(cb: () => (n: number) => number): void;

f(() => n => n + 1);

Expected behavior:

No error.

Actual behavior:

src/a.ts(4,9): error TS7006: Parameter 'n' implicitly has an 'any' type.

There is no error if I remove the first overload of f.