vec::each() and each_mut() have bad return values.

[lilyball]

vec::each() always returns true.

vec::each_mut() returns true if it broke, and false otherwise. From what I understand, this is backwards.

[nikomatsakis]

I think both sound wrong? You should return false if you break, true otherwise.

[lilyball]

Yes, I think both are wrong, which is why I listed both.