=== tests/cases/compiler/genericParameterAssignability1.ts ===
function f<T>(x: T): T { return null; }
>f : <T>(x: T) => T
>T : T
>x : T
>T : T
>T : T
>null : null

var r = <T>(x: T) => x;
>r : <T>(x: T) => T
><T>(x: T) => x : <T>(x: T) => T
>T : T
>x : T
>T : T
>x : T

r = f; // should be allowed
>r = f : <T>(x: T) => T
>r : <T>(x: T) => T
>f : <T>(x: T) => T