Trying to put a named function into a twiddle box does weird thing

[brson]

If you write something like

fn foo() { }

let bar: ~fn() = ~foo;

It won't compile because rustc tries to give you a unique pointer to a 'bare' function (I think). Making bare functions not types, like str and vec, would probably fix this.

[burg]

This will probably interact with #3320, which removes bare function types.

[catamorphism]

expected ~fn()but found~fn()`` -- reproduced as of d2ad028

[sanxiyn]

It now reports expected ~fn()but found~extern fn() (expected fn but found ~-ptr).

[catamorphism]

Since #3320 isn't blocking 0.6, this shouldn't either.

[catamorphism]

I think this is a moot point since we don't have bare function types anymore.