add some docs to `From` conversions
This adds a helpful document to the bool → int* conversions as well as to the lossless integer conversions.
One of #51430 down, some more to go.
Implement RFC 2421, 'Keyword unreservations (pure, sizeof, alignof, offsetof)
On my local machine I was getting failures in `test/ui-fulldeps`, but I was also getting them again after reverting the change, so I'm hoping that this works.
I removed the test because that's what the other PR that unreserved a keyword did and I feel that it doesn't make sense/keep value to keep a test for something removed years ago.
Miscellaneous changes to rustbuild and CI.
1. Don't build LLVM when running rust-installer.
2. If toolstate is unchanged, don't push a commit to the toolstate repo.
3. Allow `./x.py build src/librustc_codegen_llvm`
4. Added log to track #50887.
This should greatly reduce the commits on the rust-toolstate repository.
`publish_toolstate.py` defaults to keep the old status if a new one is not
found, so nothing needs to be changed to that file.
parser: Split `+=` into `+` and `=` where `+` is explicitly requested (such as generics)
Added functions in tokens to check whether a token leads with `+`. Used them when parsing to allow for token splitting of `+=` into `+` and `=`.
Fixes https://github.com/rust-lang/rust/issues/47856
Document size_of for 128-bit integers
We might want to consider separately documenting the alignment of
primitives, rather than just their size, since 128-bit integers, unlike
all other primitives, have an alignment that is not identical to their
size (size_of is 16, align_of is 8)
Re-enable trivial bounds
cc #50825
Remove implementations from global bounds in winnowing when there is ambiguity.
This results in the reverse of #24066 happening sometimes. I'm not sure if anything can be done about that though.
cc #48214
r? @nikomatsakis
Rollup of 13 pull requests
Successful merges:
- #50143 (Add deprecation lint for duplicated `macro_export`s)
- #51099 (Fix Issue 38777)
- #51276 (Dedup auto traits in trait objects.)
- #51298 (Stabilize unit tests with non-`()` return type)
- #51360 (Suggest parentheses when a struct literal needs them)
- #51391 (Use spans pointing at the inside of a rustdoc attribute)
- #51394 (Use scope tree depths to speed up `nearest_common_ancestor`.)
- #51396 (Make the size of Option<NonZero*> a documented guarantee.)
- #51401 (Warn on `repr` without hints)
- #51412 (Avoid useless Vec clones in pending_obligations().)
- #51427 (compiletest: autoremove duplicate .nll.* files (#51204))
- #51436 (Do not require stage 2 compiler for rustdoc)
- #51437 (rustbuild: generate full list of dependencies for metadata)
Failed merges:
rustbuild: generate full list of dependencies for metadata
Previously, we didn't send --features to our cargo metadata invocations,
and thus missed some dependencies that we enable through the --features
mechanism.
Do not require stage 2 compiler for rustdoc
r? @QuietMisdreavus
Fixes https://github.com/rust-lang/rust/issues/51424
I *think* this is correct; though I'm not certain. If it passes CI though I expect that to be good enough...
compiletest: autoremove duplicate .nll.* files (#51204)
UI tests in bless mode should now check to see if `.nll.*` files have a
matching `.*` file. If a match is found, it will be deleted.
This should be extensible to other modes (i.e., Polonius).
On running with `--bless`, the two files removed in #51186 are, in turn,
removed automatically.
fixes#51204
Avoid useless Vec clones in pending_obligations().
The only instance of `ObligationForest` in use has an obligation type of
`PendingPredicateObligation`, which contains a `PredicateObligation` and a
`Vec<Ty>`.
`FulfillmentContext::pending_obligations()` calls
`ObligationForest::pending_obligations()`, which clones all the
`PendingPredicateObligation`s. But the `Vec<Ty>` field of those cloned
obligations is never touched.
This patch changes `ObligationForest::pending_obligations()` to
`map_pending_obligations` -- which gives callers control about which part
of the obligation to clone -- and takes advantage of the change to avoid
cloning the `Vec<Ty>`. The change speeds up runs of a few rustc-perf
benchmarks, the best by 1%.
Make the size of Option<NonZero*> a documented guarantee.
Closes#49137, the tracking issue for `NonZero*`, as this was the last remaining open question.
Note that `ptr::NonNull<T>` already documents a similar guarantee.
Use scope tree depths to speed up `nearest_common_ancestor`.
This patch adds depth markings to all entries in the `ScopeTree`'s
`parent_map`. This change increases memory usage somewhat, but permits a
much faster algorithm to be used:
- If one scope has a greater depth than the other, the deeper scope is
moved upward until they are at equal depths.
- Then we move the two scopes upward in lockstep until they match.
This avoids the need to keep track of which scopes have already been
seen, which was the major part of the cost of the old algorithm. It also
reduces the number of child-to-parent moves (which are hash table
lookups) when the scopes start at different levels, because it never
goes past the nearest common ancestor the way the old algorithm did.
Finally, the case where one of the scopes is the root is now handled in
advance, because that is moderately common and lets us skip everything.
This change speeds up runs of several rust-perf benchmarks, the best by
6%.
A selection of the bigger improvements:
```
clap-rs-check
avg: -2.6% min: -6.6% max: 0.0%
syn-check
avg: -2.2% min: -5.0% max: 0.0%
style-servo-check
avg: -2.9%? min: -4.8%? max: 0.0%?
cargo-check
avg: -1.3% min: -2.8% max: 0.0%
sentry-cli-check
avg: -1.0% min: -2.1% max: 0.0%
webrender-check
avg: -0.9% min: -2.0% max: 0.0%
style-servo
avg: -0.9%? min: -1.8%? max: -0.0%?
ripgrep-check
avg: -0.7% min: -1.8% max: 0.1%
clap-rs
avg: -0.9% min: -1.6% max: -0.2%
regex-check
avg: -0.2% min: -1.3% max: 0.1%
syn
avg: -0.6% min: -1.3% max: 0.1%
hyper-check
avg: -0.5% min: -1.1% max: 0.0%
```
The idea came from multiple commenters on my blog and on Reddit. Thank you!
r? @nikomatsakis
Use spans pointing at the inside of a rustdoc attribute
Follow up to #51111.
Point to the link in a rustdoc attribute where intralink resolution failed, instead of the full rustdoc attribute's span.
r? @GuillaumeGomez cc @kennytm
Suggest parentheses when a struct literal needs them
When writing a struct literal in an expression that expects a block to
be started afterwards (like an `if` statement), do not suggest using the
same struct literal:
```
did you mean `S { /* fields * /}`?
```
Instead, suggest surrounding the expression with parentheses:
```
did you mean `(S { /* fields * /})`?
```
Fix#47360, #50090. Leaving #42982 open to come back to this problem with a better solution.
