Backport of PRs to Beta#25192

Merged

brson merged 7 commits intorust-lang:betafrom

alexcrichton:beta-backport

May 7, 2015

Commits on May 7, 2015

lint: deny transmuting from immutable to mutable, since it's undefined behavior

seanmonstar
authored and
alexcrichton
committed
std: update select internals to not use mutable transmuting

seanmonstar
authored and
alexcrichton
committed
test: update run-pass tests to not use mutable transmuting

seanmonstar
authored and
alexcrichton
committed
std: Remove index notation on slice iterators
alexcrichton
committed
std: Destabilize io::BufStream
alexcrichton
committed
Make RwLock::try_write try to obtain a write lock

hydhknn
authored and
alexcrichton
committed
std: Remove addition on vectors for now
alexcrichton
committed