* Get rid of by-value-self workarounds; it works now
* Remove type annotations, they're not needed anymore

Added into_owned() method for vectors
Added DoubleEnded Iterator impl to Option
Renamed nil.rs to unit.rs

The new macro is available under the name ifmt! (only an intermediate name)

These are both obsoleted by the forthcoming new GC.

Fixes #7922.
Signed-off-by: NOGINO Masanori <masanori.ogino@gmail.com>

If the TLS key is 0-sized, then the linux linker is apparently smart enough to
put everything at the same pointer. OSX on the other hand, will reserve some
space for all of them. To get around this, the TLS key now actuall consumes
space to ensure that it gets a unique pointer

the `test/run-pass/class-trait-bounded-param.rs` test was xfailed and
written in an ancient dialect of Rust so I've just removed it

this also removes `to_vec` from DList because it's provided by
`std::iter::to_vec`

an Iterator implementation is added for OptVec but some transitional
internal iterator methods are still left

New snapshot means this can all go. Also removes places that have
comments that say they are workarounds for stage0 errors.

The ptr module is intended to be for raw pointers.

Closes #3111

Adds documentation for various things that I understand.
Adds #[allow(missing_doc)] for lots of things that I don't understand.

This only changes the directory names; it does not change the "real"
metadata names.

Also fix up all the fallout elsewhere throughout core. It's really nice being
able to have the prelude.