Library doesn't have a way to iterate over an integer range with for

[msullivan]

We have a convention for early break from iteration functions; we should update int::range to use it or we should add a new function that does this.

[eholk]

@pcwalton ran into this issue yesterday too.

[nikomatsakis]

It is my opinion that all iter() style functions are outdated and should be replaced with breakable equivalents.

[brson]

Fixed in 432c6cb