Make ptr::write const
~~The code in this PR as of right now is not much more than an experiment.~~
~~This should, if I am not mistaken, in theory compile and pass the tests once the bootstraping compiler is updated. Thus the PR is blocked on that which should happen some time after the February the 9th. Also we might want to wait for #79989 to avoid regressing performance due to using `mem::forget` over `intrinsics::forget`~~.
Add an impl of Error on `Arc<impl Error>`.
`Display` already exists so this should be a non-controversial change (famous last words).
Would have to be insta-stable.
Convert core/num/mod.rs to intra-doc links
Helps with #75080.
This can't convert the associated constants `MAX` and `MIN` until #74489 is merged.
r? `@poliorcetics`
Prevent to compute Item attributes twice
I came across this case when working on another part of rustdoc. Not a game changer but a nice little improvement.
cc `@camelid`
r? `@jyn514`
move upper_case_acronyms back to style, but make the default behaviour less aggressive by default (can be unleashed via config option)
Previous discussion in the bi-weekly clippy meeting for reference: https://rust-lang.zulipchat.com/#narrow/stream/257328-clippy/topic/Meeting.202021-02-23/near/227458019
Move the `upper_case_acronyms` lint back to the style group.
Only warn on fully-capitalized names by default.
Add add a clippy-config option `upper-case-acronyms-aggressive: true/false` to enabled more aggressive linting on
all substrings that could be capitalized acronyms.
---
changelog: reenable upper_case_acronyms by default but make the more aggressive linting opt-in via config option
This avoids naming collisions, particularly on Windows where the
dynamic library variable is PATH and setting it causes the in-tree
`tidy` to take precedence over the HTML tidy used by compiletest.
Expand FlattenCompat folds
The former `chain`+`chain`+`fold` implementation looked nice from a
functional-programming perspective, but it introduced unnecessary layers
of abstraction on every `flat_map`/`flatten` fold. It's straightforward
to just fold each part in turn, and this makes it look like a simplified
version of the existing `try_fold` implementation.
For the `iter::bench_flat_map*` benchmarks, I get a large improvement in
`bench_flat_map_chain_sum`, from 1,598,473 ns/iter to 499,889 ns/iter,
and the rest are unchanged.
Moves the lint back from pedantic to style group.
The lint default now only warns on names that are completely capitalized, like "WORD"
and only if the name is longer than 2 chars (so that names where each of the letter represents a word are still distinguishable).
For example: FP (false positive) would still be "valid" and not warned about (but EOF would warn).
A "upper_case_acronyms_aggressive: true/false" config option was added that restores the original lint behaviour to warn
on any kind of camel case name that had more than one capital letter following another capital letter.
This was introduced as part of the MVP for `download-rustc`.
Unfortunately, it doesn't work very well:
- Steps are ignored by default, which makes it easy to leave out a step
that should be built. For example, the MVP forgot to enable any tests,
so it was *only* possible to build locally.
- It didn't work correctly even when it was enabled: calling
`builder.ensure()` would completely ignore the constant and rebuild the
step anyway. This has no obvious fix since `ensure()` has to return a
`Step::Output`.
Instead, this handles `download-rustc` in `impl Step for Rustc` and
`impl Step for Std`, which to my knowledge are the only build steps that
don't first go through `impl Step for Sysroot` (`Rustc` is used for
the `rustc-dev` component).
See https://github.com/rust-lang/rust/pull/79540#discussion_r563350075
and https://github.com/rust-lang/rust/issues/81930 for further context.
Here are some example runs with these changes and `download-rustc`
enabled:
```
$ x.py build src/tools/clippy
Building stage1 tool clippy-driver (x86_64-unknown-linux-gnu)
Finished release [optimized] target(s) in 1m 09s
Building stage1 tool cargo-clippy (x86_64-unknown-linux-gnu)
Finished release [optimized] target(s) in 0.11s
$ x.py test src/tools/clippy
Updating only changed submodules
Submodules updated in 0.01 seconds
Finished dev [unoptimized + debuginfo] target(s) in 0.09s
Building stage1 tool clippy-driver (x86_64-unknown-linux-gnu)
Finished release [optimized] target(s) in 0.09s
Building rustdoc for stage1 (x86_64-unknown-linux-gnu)
Finished release [optimized] target(s) in 0.28s
Finished release [optimized] target(s) in 15.26s
Running build/x86_64-unknown-linux-gnu/stage1-tools/x86_64-unknown-linux-gnu/release/deps/clippy_driver-8b407b140e0aa91c
test result: ok. 592 passed; 0 failed; 3 ignored; 0 measured; 0 filtered out
$ x.py build src/tools/rustdoc
Building rustdoc for stage1 (x86_64-unknown-linux-gnu)
Finished release [optimized] target(s) in 41.28s
Build completed successfully in 0:00:41
$ x.py test src/test/rustdoc-ui
Building stage0 tool compiletest (x86_64-unknown-linux-gnu)
Finished release [optimized] target(s) in 0.12s
Building rustdoc for stage1 (x86_64-unknown-linux-gnu)
Finished release [optimized] target(s) in 0.10s
test result: ok. 105 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 8.15s
$ x.py build compiler/rustc
Finished dev [unoptimized + debuginfo] target(s) in 0.09s
Build completed successfully in 0:00:00
```
Note a few things:
- Clippy depends on stage1 rustc-dev artifacts, but rustc didn't have to
be recompiled. Instead, the artifacts were copied automatically.
- All steps are always enabled. There is no danger of forgetting a step,
since only the entrypoints have to handle `download-rustc`.
- Building the compiler (`compiler/rustc`) automatically does no work.
Remove is_spotlight field from `Trait`
Small PR, only the last commit is relevant here. The rest is coming from #80883 because I need the `TyCtxt` stored inside `Cache`.
The point is to make ItemKind looks as close as possible to the compiler type so that it makes the switch simpler (which is why I make all these "small" PRs).
r? `@jyn514`
