libcore: Fix `Sized` bounds on overloaded function traits.

- Remove the `for Sized?` bound on `core::ops::FnOnce`, as it takes
  `self` by value and can never be implemented by an unsized type.
- Add a missing `Sized?` bound to the blanket `core::ops::FnMut` impl,
  as both `Fn` and `FnMut` are `for Sized?`.
fix 404
work around portability issue on FreeBSD, in which the key returned from
pthread_key_create can be 0.
prefer "FIXME" to "TODO".
librustc: Fix debuginfo for captured variables in non-FnOnce unboxed closures.
Correct minor typos on the ownership guide.

liftimes -> lifetimes
Typo
Feature-gate explicit unboxed closure method calls & manual impls,
detect UFCS drop and allow UFCS methods to have explicit type parameters.

Work towards #18875.

Since code could previously call the methods & implement the traits
manually, this is a

[breaking-change]

Closes #19586. Closes #19375.
Implement lifetime elision for Foo(...) -> ... type sugar.

This means that `Fn(&A) -> (&B, &C)` is equivalent to `for<'a> Fn(&'a A)
-> (&'a B, &'a C)` similar to the lifetime elision of lower-case `fn` in
types and declarations.

Closes #18992.
Add a doctest for BTreeMap's iter method.
- Support gcc-less installation on Windows.  To do so in unattended mode run:`<intaller>.exe /TYPE=compact /SILENT`.
- Do not require admin privileges to install.
Fix false positive alerts from a run-pass test on Command.

Reported as a part of rust-lang/rust#19120

The logic of rust-lang/rust@74fb798a200dc82cf5b4a18065e3ea565229adc3 was
flawed because when a CI tool run the test parallely with other tasks,
they all belong to a single session family and the test may pick up
irrelevant zombie processes before they are reaped by the CI tool
depending on timing.

Also, panic! inside a loop over all children makes the logic simpler.

By not destructing the return values of Command::spawn() until
find_zombies() finishes, I believe we can conduct a slightly stricter
test.

Signed-off-by: NODA, Kai <nodakai@gmail.com>
Add missing semicolon to hello world program in intro.
remove usage of notrust from the docs

Fixes #19599
Correct the reference with regards to floats

Fixes #19595.
Add enum namespacing to the Guide.

Closes #19556.
Make MemoryMap use HANDLE on Windows.
Also fixes some conflicting module names.

Signed-off-by: Peter Atashian <retep998@gmail.com>
Remove mention of Dequeue in collections docs.

  https://botbot.me/mozilla/rust/2014-12-07/?msg=27003846&page=20
string: Use the iterator size_hint() in .extend()
string: Implement FromIterator<&str> and Extend<&str> for String

&str is a "particle" of a string already, see the graphemes iterator,
so it seems natural that we should be able to use it with Extend.