Show lint names
Remove #[cfg(notest)] and use #[cfg(not(test))] to cooincide with #[cfg(debug)]
libstd: convert chained ifs to a match in base64.
Fix typos
fix incorrect region code based on the old 'self

also removes unnecessary casts from the RcMut implementation
rename iter::iter_to_vec to iter::to_vec

it's silly to duplicate the namespace in the fn name
libstd: Remove mutable fields from fileinput and net_tcp
libstd: Remove mutable fields from flatpipes and io_util
libstd: Remove mutable fields from future and par
libstd: Start warning about mutable fields, now that they only exist in stage0
libcore: Remove mutable fields from rand.
libcore: Remove mutable fields from os and ptr
libcore: Remove mutable fields from hash
libcore: Remove mutable fields from task::spawn
libcore: Remove mutable fields from the task builder API
libcore: Remove mutable fields from pipes
libcore: Remove mutable fields from repr
Remove mutable fields from comm by using casts. Also mark the cast in cell.
libcore: Remove more mutable fields from comm
libstd: Remove some residual mutable fields