Misc fixes for configure
Currently,
`./configure` at armv6 machines ends up with
```
configure: error: unknown CPU type: armv6l
```
`./configure` at armv7 machines **silently** produces build for armv6 (compatible, but suboptimal)
```
configure: CFG_BUILD := arm-unknown-linux-gnueabihf
```
Copyediting on documentation for write! and writeln!
Fix various sentence fragments, missing articles, and other grammatical issues in the documentation for write! and writeln!.
Also fix the links (and link names) for common return types.
(Noticed when preparing https://github.com/rust-lang/rust/pull/37472 ; posted separately to avoid mixing the new documentation with copyedits to existing documentation.)
Prevent exhaustive matching of Ordering to allow for future extension
The C++11 atomic memory model defines a `memory_order_consume` ordering which is generally equivalent to `memory_order_acquire` but can allow better code generation by avoiding memory barrier instructions. Most compilers (including LLVM) currently do not implement this ordering directly and instead treat it identically to `memory_order_acquire`, including adding a memory barrier instruction.
There is currently [work](http://open-std.org/Jtc1/sc22/wg21/docs/papers/2016/p0098r1.pdf) to support consume ordering in compilers, and it would be a shame if Rust did not support this. This PR therefore reserves a `__Nonexhaustive` variant in `Ordering` so that adding a new ordering is not a breaking change in the future.
This is a [breaking-change] since it disallows exhaustive matching on `Ordering`, however a search of all Rust code on Github shows that there is no code that does this. This makes sense since `Ordering` is typically only used as a parameter to an atomic operation.
More refactoring to obey platform abstraction lint
The most interesting things here are moving `std/sys/common` to `std/sys_common`, and `std/num/{f32,f64}.rs` to `std/{f32,f64}.rs`, and adding more documentation to `std/lib.rs`.
r? @alexcrichton
typeck: Fix error reporting of wrong entry function signatures
Expected and actual type were switched, this was introduced by
refactoring in 8eb12d91aa.
This commit partially inlines two functions, `find_cycles_from_node` and
`mark_as_waiting_from`, at two call sites in order to avoid function
unnecessary function calls on hot paths.
It also fully inlines and removes `is_popped`.
These changes speeds up rustc-benchmarks/inflate-0.1.0 by about 2% when
doing debug builds with a stage1 compiler.
Fix ICE when printing closures, and other similar types
Follow-up of https://github.com/rust-lang/rust/pull/37459, further fixes those problems.
Potentially actually fixes#36622, though @eddyb may want to not let that close if the rename of RUST_LOG is deemed part of that issue.
Potentially should be beta-nominated as well?
r? @eddyb
The new handling fixed a latent bug in the parser error handling where
it would only abort after the second error (when configured to stop
after the first error). This is because the check for `error_count != 0`
was occuring before the increment. Since the increment is tied to the
`emit()` call now this no longer occurs.
- correct indentation
- rename `from_cause` to `from_obligation_cause`
- break up `compare_impl_method` into fns
- delete some blank lines and correct comment
