Specify reentrancy gurantees of `Once::call_once`
I don't think the docs are clear about what happens in the following code
```rust
static INIT: Once = ONCE_INIT;
INIT.call_once(|| INIT.call_once(|| println!("huh?")));
```
[Playground](https://play.rust-lang.org/?gist=15dde1f68a6ede263c7250c36977eade&version=stable&mode=debug&edition=2015)
Let's "specify" the behavior to make it clear that the current behavior (deadlock I think?) is not a strict guarantee.
volatile operations docs: clarify that this does not help wrt. concurrency
Triggered by https://github.com/rust-lang/rust/pull/52391. Cc @stjepang @Amanieu
Should the intrinsics themselves also get more documentation? They generally do not seem to have much of that.
rustbuild: fix local_rebuild
If we detect a local rebuild (e.g. bootstrap compiler is the same version as target compiler), we set stage to 1.
When trying to build e.g. UnstableBook, we use Mode::ToolBootstrap and stage is 1.
Just allow Mode::ToolBootstrap and stagge != 0 if we are in a local_rebuild
This fixes building current master using current beta (as master hasn't yet been bumped to 1.30).
This should be backported to beta too, as currently we cannot build beta using itself because of that.
r? @alexcrichton
App-lint-cability
@eminence recently pointed out (rust-lang/cargo#5846) that it's
surprising that `cargo fix` (now shipping with Cargo itself!) doesn't
fix very common lint warnings, which is as good of a reminder as any
that we should finish #50723.
(Previously, we did this on the librustc and libsyntax crates in #50724. I filed cmr/this-week-in-rust#685 in hopes of recruiting new contributors to do the rest.)
r? @estebank
Align 6-week cycle check with beta promotion instead of stable release.
The regression check is to make beta promotion easier, so it makes more
sense to use the Tuesday of the release week (T-2) as the end point of the
regression prevention, instead of Thursday (T-0). But since the beta
promotion PR is sent at Tuesday evening at UTC, the protection should
include the whole Tuesday as well, meaning the 6-week cycle will start from
Wednesdays.
This will also move the start of the regression protection week one day
earlier.
By adding empty `after` content that clears and is `display: block`.
Technique found here: https://stackoverflow.com/a/7817313/51683
Now any part of a documentation search result that is highlighted when
you hover over it should also be clickable.
Namely, the code here was trying to be clever, and say "lets not
report diagnostics when we 'know' NLL will report an error about them
in the future."
The problem is that in migration mode, when no error was reported here,
the NLL error that we "knew" was coming was downgraded to a warning (!).
This fixes that by only doing the "clever" skipping of region error reporting
when we are not in migration mode.
Rather than make a separate test for issue 53026, I just took the test
that uncovered this in a first place, and extended it (via our
revisions system) to explicitly show all three modes in action:
ACT-borrowck, NLL, and NLL migration mode.
(Tto be honest I hope not to have to add such revisions to many tests.
Instead I hope to adopt some sort of new `compare-mode` for either
borrowck=migrate or for the 2018 edition as a whole.)
Reintroduce `Undef` and properly check constant value sizes
r? @RalfJung
cc @eddyb
basically all kinds of silent failures that never occurred are assertions now
Disable debug sections when optimization flags is set for LLD.
Currently LLD does not error when optimization is set and debugging information sections are present. (See discussion at https://reviews.llvm.org/D47901)
Using `--strip-debug` along with the `-O` option.
check_const: use the same ParamEnv as codegen for statics
Fixes at least part of https://github.com/rust-lang/rust/issues/52849 (my CTFE-stress benchmark). Note that I do not know what I am doing here, this is just based on hints from @oli-obk.
r? @oli-obk
If one doesn't view integers as containers of bytes, converting them to
bytes necessarily needs the specfication of encoding.
I think Rust is a language that wants to be explicit. The `to_bytes`
function is basically the opposite of that – it converts an integer into
the native byte representation, but there's no mention (in the function
name) of it being very much platform dependent. Therefore, I think it
would be better to replace that method by three methods, the explicit
`to_ne_bytes` ("native endian") which does the same thing and
`to_{le,be}_bytes` which return the little- resp. big-endian encoding.
Update tool submodules, update feature unification strategy
* Bring in some fixes for `cargo fix`
* Update RLS/rustfmt to keep them compiling
* Update all tools to [depend on `rustc-workspace-hack`](https://github.com/rust-lang/rust/pull/52919#issuecomment-409802418)
* Change how we deal with feature unification amongst these builds.
