libs (threads)
Move the contents of std::thread_local into std::thread. Fully
remove std::thread_local from the standard library.
Thread locals are directly related to threading. Combining the modules
would reduce the number of top level modules, combine related concepts,
and make browsing the docs easier. It also would have the potential to
slightly reduce the number of use statements.
The contents ofstd::thread_local module would be moved into to
std::thread::local. Key would be renamed to LocalKey, and
scoped would also be flattened, providing ScopedKey, etc. This
way, all thread related code is combined in one module.
It would also allow using it as such:
use std::thread::{LocalKey, Thread};
It's pretty late in the 1.0 release cycle. This is a mostly bike
shedding level of a change. It may not be worth changing it at this
point and staying with two top level modules in std. Also, some users
may prefer to have more top level modules.
An alternative (as the RFC originally proposed) would be to bring
thread_local in as a submodule, rather than flattening. This was
decided against in an effort to keep hierarchies flat, and because of
the slim contents on the thread_local module.
The exact strategy for moving the contents into std::thread