container/iterator improvements + small changes

[thestinger]

5f3a637 r=huonw
934a5eb r=thestinger
0f6e90a r=cmr

[graydon]

Hm. Is range_inclusive really important? It's just range with one greater on the argument, no?

[thestinger]

@graydon: it lets you work around overflow, since range(0, int::max_value) will be one short of the full range

[alexcrichton]

Is that a common enough use case to have a function in std for it? It seems like at that point you should just have a local mut variable.

[thestinger]

I want to get rid of the old range functions in {,u}int-macros.rs so this is replacing part of the functionality of range_step_inclusive (with it being extended to handle steps other than 1 later).

I do expect iterating over [0 .. u8::max_value], [0 .. u16::max_value], etc. to be more than just a corner case though so I think it's worth including.

[asb]

FWIW, I'm with @thestinger on range_inclusive being useful for iterating over all of u8 or u16, and to be honest I prefer it to adding +1 to the top of the range even outside of those usecases.