Only suggest removing semicolon when expression is compatible with `impl Trait`
https://github.com/rust-lang/rust/issues/54771#issuecomment-476423690
> It still needs checking that the last statement's expr can actually conform to the trait, but the naïve behavior is there.
Only suggest removing a semicolon when the type behind the semicolon actually implements the trait in an RPIT `-> impl Trait`. Also upgrade the label that suggests removing the semicolon to a suggestion (should it be verbose?).
cc #54771
Rollup of 7 pull requests
Successful merges:
- #95566 (Avoid duplication of doc comments in `std::char` constants and functions)
- #95784 (Suggest replacing `typeof(...)` with an actual type)
- #95807 (Suggest adding a local for vector to fix borrowck errors)
- #95849 (Check for git submodules in non-git source tree.)
- #95852 (Fix missing space in lossy provenance cast lint)
- #95857 (Allow multiple derefs to be splitted in deref_separator)
- #95868 (rustdoc: Reduce allocations in a `html::markdown` function)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Allow multiple derefs to be splitted in deref_separator
Previously in #95649 only a single deref within projection was supported and multiple derefs caused a bunch of issues, this PR fixes those issues.
```@oli-obk``` helped a ton again ❤️
Suggest replacing `typeof(...)` with an actual type
This PR adds suggestion to replace `typeof(...)` with an actual type of `...`, for example in case of `typeof(1)` we suggest replacing it with `i32`.
If the expression
1. Is not const (`{ let a = 1; let _: typeof(a); }`)
2. Can't be found (`let _: typeof(this_variable_does_not_exist)`)
3. Or has non-suggestable type (closure, generator, error, etc)
we don't suggest anything.
The 1 one is sad, but it's not clear how to support non-consts expressions for `typeof`.
_This PR is inspired by [this tweet]._
[this tweet]: https://twitter.com/compiler_errors/status/1511945354752638976
Make def names and HIR names consistent.
The name in the `DefKey` is interned to create the `DefId`, so it does not
require any query to access. This can be leveraged to avoid a few useless
HIR accesses for names.
~In order to achieve that, generic parameters created from universal
impl-trait are given the pretty-printed ast as a name, instead of
`{{opaque}}`.~
~Drive-by: the `TyCtxt::opt_item_name` used a dummy span for non-local
definitions. We have access to `def_ident_span`, so we use it.~
expand: Remove `ParseSess::missing_fragment_specifiers`
It was used for deduplicating some errors for legacy code which are mostly deduplicated even without that, but at cost of global mutable state, which is not a good tradeoff.
cc https://github.com/rust-lang/rust/pull/95747#issuecomment-1091619403
r? ``@nnethercote``
Left overs of #95761
These are just nits. Feel free to close this PR if all modifications are not worth merging.
* `#![feature(decl_macro)]` is not needed anymore in `rustc_expand`
* `tuple_impls` does not require `$Tuple:ident`. I guess it is there to enhance readability?
r? ```@petrochenkov```
refactor: simplify few string related interactions
Few small optimizations:
check_doc_keyword: don't alloc string for emptiness check
check_doc_alias_value: get argument as Symbol to prevent needless string convertions
check_doc_attrs: don't alloc vec, iterate over slice.
replace as_str() check with symbol check
get_single_str_from_tts: don't prealloc string
trivial string to str replace
LifetimeScopeForPath::NonElided use Vec<Symbol> instead of Vec<String>
AssertModuleSource use FxHashSet<Symbol> instead of BTreeSet<String>
CrateInfo.crate_name replace FxHashMap<CrateNum, String> with FxHashMap<CrateNum, Symbol>
It was used for deduplicating some errors for legacy code which are mostly deduplicated even without that, but at cost of global mutable state, which is not a good tradeoff.
interpret: err instead of ICE on size mismatches in to_bits_or_ptr_internal
We did this a while ago already for `to_i32()` and friends, but missed this one. That became quite annoying when I was debugging an ICE caused by `read_pointer` in a Miri shim where the code was passing an argument at the wrong type.
Having `scalar_to_ptr` be fallible is consistent with all the other `Scalar::to_*` methods being fallible. I added `unwrap` only in code outside the interpreter, which is no worse off than before now in terms of panics.
r? ````@oli-obk````
Remove explicit delimiter token trees from `Delimited`.
They were introduced by the final commit in #95159 and gave a
performance win. But since the introduction of `MatcherLoc` they are no
longer needed. This commit reverts that change, making the code a bit
simpler.
r? `@petrochenkov`
Strict provenance lints
See #95488.
This PR introduces two unstable (allow by default) lints to which lint on int2ptr and ptr2int casts, as the former is not possible in the strict provenance model and the latter can be written nicer using the `.addr()` API.
Based on an initial version of the lint by ```@Gankra``` in #95199.
Cached stable hash cleanups
r? `@nnethercote`
Add a sanity assertion in debug mode to check that the cached hashes are actually the ones we get if we compute the hash each time.
Add a new data structure that bundles all the hash-caching work to make it easier to re-use it for different interned data structures
They were introduced by the final commit in #95159 and gave a
performance win. But since the introduction of `MatcherLoc` they are no
longer needed. This commit reverts that change, making the code a bit
simpler.
Enforce well formedness for type alias impl trait's hidden type
fixes#84657
This was not an issue with return-position-impl-trait because the generic bounds of the function are the same as those of the opaque type, and the hidden type must already be well formed within the function.
With type-alias-impl-trait the hidden type could be defined in a function that has *more* lifetime bounds than the type alias. This is fine, but the hidden type must still be well formed without those additional bounds.
* split `fuzzy_provenance_casts` into a ptr2int and a int2ptr lint
* feature gate both lints
* update documentation to be more realistic short term
* add tests for these lints
check_doc_alias_value: get argument as Symbol to prevent needless string convertions
check_doc_attrs: don't alloc vec, iterate over slice. Vec introduced in #83149, but no perf run posted on merge
replace as_str() check with symbol check
get_single_str_from_tts: don't prealloc string
trivial string to str replace
LifetimeScopeForPath::NonElided use Vec<Symbol> instead of Vec<String>
AssertModuleSource use BTreeSet<Symbol> instead of BTreeSet<String>
CrateInfo.crate_name replace FxHashMap<CrateNum, String> with FxHashMap<CrateNum, Symbol>
This commit suggests replacing typeof(...) with an actual type of "...",
for example in case of `typeof(1)` we suggest replacing it with `i32`.
If the expression
- Is not const (`{ let a = 1; let _: typeof(a); }`)
- Can't be found (`let _: typeof(this_variable_does_not_exist)`)
- Or has non-suggestable type (closure, generator, error, etc)
we don't suggest anything.
Report opaque type mismatches directly during borrowck of the function instead of within the `type_of` query.
This allows us to only store a single hidden type per opaque type instead of having to store one per set of substitutions.
r? `@compiler-errors`
This does not affect diagnostics, because the diagnostic messages are exactly the same.
