Parse macros in patterns

Fixes #6830.
Test pattern macros
auto merge of #14298 : kmcallister/rust/pattern-macros, r=huonw

First commit is an unrelated fix for a test suite warning I introduced last week.
auto merge of #14465 : Ryman/rust/patch-1, r=alexcrichton
auto merge of #14476 : luqmana/rust/docs, r=alexcrichton

We were still generating compiler docs even with --disable-docs passed.

cc @pnkfelix
Don't enable libcpp for llvm by default.
auto merge of #14451 : alexcrichton/rust/issue-14442, r=brson

This avoids having to perform conversions from `*u8` to `&'static str` which can
suck in a good deal of code.

Closes #14442
Replace StrAllocating.into_owned() with .into_string()

We already have into_string(), but it was implemented in terms of
into_owned(). Flip it around and deprecate into_owned().

Remove a few spurious calls to .into_owned() that existed in libregex
and librustdoc.
auto merge of #14477 : alexcrichton/rust/issue-14456, r=brson

When spawning a process, stdio file descriptors can be configured to be ignored,
which basically means that they'll be closed. Currently this is done by
literally closing the file descriptors in the child, but this can have adverse
side effects if the child process then opens a new file descriptor, assigning it
to a stdio number.

To work around the problems of the child, this commit alters the process
spawning code to map stdio fds to /dev/null on unix (and a similar equivalent on
windows) when they are specified as being ignored. This should allow spawned
programs to have more expected behavior when opening new files.

Closes #14456
remove /build from .gitignore since there is build/
auto merge of #14472 : huonw/rust/native-lib-warnings, r=alexcrichton

rustc: clarify warning about native deps for a staticlib.

This adjusts the "unlinked native library" warning one receives when
compiling with `crate_type="staticlib"`. The warning is just trying to
tell the user that they need to link against these libraries, but the
old text wasn't making this obvious, the new text says this explicitly.
auto merge of #14506 : luqmana/rust/fc, r=alexcrichton

This used to be clang only but accidentally became the default for everyone.
auto merge of #14481 : alexcrichton/rust/no-format-strbuf, r=sfackler

* Removes `format_strbuf!()`
Revert erroneous fix to tutorial
debuginfo: Add documentation comments to debuginfo.rs

Conflicts:
	src/librustc/middle/trans/debuginfo.rs
debuginfo: Make DWARF representation of enums uniform.

So far the DWARF information for enums was different
for regular enums, univariant enums, Option-like enums,
etc. Regular enums were encoded as unions of structs,
while the other variants were encoded as bare structs.

With the changes in this PR all enums are encoded as
unions so that debuggers can reconstruct if something
originally was a struct, a univariant enum, or an
Option-like enum. For the latter case, information
about the Null variant is encoded into the union field
name. This information can then be used by the
debugger to print a None value actually as None
instead of Some(0x0).
auto merge of #14487 : arielb1/rust/fix-13933, r=alexcrichton

Fix issue #13933 in a few files. A more complete fix would require core::raw::MutSlice.
auto merge of #14488 : SimonSapin/rust/patch-11, r=alexcrichton

According to the corresponding section, accessing a mutable static variable requires `unsafe` too, and I believe it counts as as language level feature. Add it to the relevant list in the Unsafety section.
auto merge of #14492 : alexcrichton/rust/totaleq, r=pnkfelix

This is a transitionary step towards completing #12517. This change modifies the
compiler to accept Partial{Ord,Eq} as deriving modes which will currently expand
to implementations of PartialOrd and PartialEq (synonyms for Eq/Ord).

After a snapshot, all of deriving(Eq, Ord) will be removed, and after a snapshot
of that, TotalEq/TotalOrd will be renamed to Eq/Ord.
syntax: Fix span on illegal ABI errors

Fixes #8537
Fixes #14499