lifetime elision should apply to closure types

[comex]

fn help(f: fn(a: &int, b: &int) -> int) {} // OK
fn help2<F: Fn(&int, &int) -> int>(f: F) {} // error

->

hhh.rs:3:16: 3:20 error: missing lifetime specifier [E0106]
hhh.rs:3 fn help2<F: Fn(&int, &int) -> int>(f: F) {}
                        ^~~~
hhh.rs:3:22: 3:26 error: missing lifetime specifier [E0106]
hhh.rs:3 fn help2<F: Fn(&int, &int) -> int>(f: F) {}
                              ^~~~

It seems like it can't possibly be right that this would work for one but not the other.

[huonw]

Covered by rust-lang/rfcs#387.

[comex]

I see.