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Remove global `next_disambiguator` state and handle it with a `DisambiguatorState` type
This removes `Definitions.next_disambiguator` as it doesn't guarantee deterministic def paths when `create_def` is called in parallel. Instead a new `DisambiguatorState` type is passed as a mutable reference to `create_def` to help create unique def paths. `create_def` calls with distinct `DisambiguatorState` instances must ensure that that the def paths are unique without its help.
Anon associated types did rely on this global state for uniqueness and are changed to use (method they're defined in + their position in the method return type) as the `DefPathData` to ensure uniqueness. This also means that the method they're defined in appears in error messages, which is nicer.
`DefPathData::NestedStatic` is added to use for nested data inside statics instead of reusing `DefPathData::AnonConst` to avoid conflicts with those.
cc `@oli-obk`
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implement or-patterns for pattern types
These are necessary to represent `NonZeroI32`, as the range for that is `..0 | 1..`. The `rustc_scalar_layout_range_*` attributes avoided this by just implementing wraparound and having a single `1..=-1` range effectively. See https://rust-lang.zulipchat.com/#narrow/channel/481660-t-lang.2Fpattern-types/topic/.60or.20pattern.60.20representation.20in.20type.20system/with/504217694 for some background discussion
cc https://github.com/rust-lang/rust/issues/123646
r? `@BoxyUwU`
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`DisambiguatorState` type
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Move inline asm check to typeck, properly handle aliases
Pull `InlineAsmCtxt` down to `rustc_hir_typeck`, and instead of using things like `Ty::is_copy`, use the `InferCtxt`-aware methods. To fix https://github.com/rust-lang/trait-system-refactor-initiative/issues/189, we also add a `try_structurally_resolve_*` call to `expr_ty`.
r? lcnr
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Remove `weak` alias terminology
I find the "weak" alias terminology to be quite confusing. It implies the existence of "strong" aliases (which do not exist) and I'm not really sure what about weak aliases is "weak". I much prefer "free alias" as the term. I think it's much more obvious what it means as "free function" is a well defined term that already exists in rust.
It's also a little confusing given "weak alias" is already a term in linker/codegen spaces which are part of the compiler too. Though I'm not particularly worried about that as it's usually very obvious if you're talking about the type system or not lol. I'm also currently trying to write documentation about aliases and it's somewhat awkward/confusing to be talking about *weak* aliases, when I'm not really sure what the basis for that as the term actually *is*.
I would also be happy to just find out there's a nice meaning behind calling them "weak" aliases :-)
r? `@oli-obk`
maybe we want a types MCP to decide on a specific naming here? or maybe we think its just too late to go back on this naming decision ^^'
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check types of const param defaults
fixes #139643 by checking that the type of a const parameter default matches the type of the parameter as long as both types are fully concrete
r? `@BoxyUwU`
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replace `GenericArg` with `Term` where applicable
r? types
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Remove redundant check
We still check for `rustc_on_unimplemented` on implementations, but this functionality was removed in https://github.com/rust-lang/rust/pull/139091, since then it always returns `Ok` when called with a non-trait defid.
https://github.com/rust-lang/rust/blob/b4c8b0c3f0533bb342a4873ff59bdad3883ab8e3/compiler/rustc_trait_selection/src/error_reporting/traits/on_unimplemented.rs#L557-L564
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Make #![feature(let_chains)] bootstrap conditional in compiler/
Let chains have been stabilized recently in #132833, so we can remove the gating from our uses in the compiler (as the compiler uses edition 2024).
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deref patterns: implement implicit deref patterns
This implements implicit deref patterns (per https://hackmd.io/4qDDMcvyQ-GDB089IPcHGg#Implicit-deref-patterns) and adds tests and an unstable book chapter.
Best reviewed commit-by-commit. Overall there's a lot of additions, but a lot of that is tests, documentation, and simple(?) refactoring.
Tracking issue: #87121
r? ``@Nadrieril``
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Rename `LifetimeName` as `LifetimeKind`.
It's a much better name, more consistent with how we name such things.
Also rename `Lifetime::res` as `Lifetime::kind` to match. I suspect this field used to have the type `LifetimeRes` and then the type was changed but the field name remained the same.
r? ``@BoxyUwU``
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It's a much better name, more consistent with how we name such things.
Also rename `Lifetime::res` as `Lifetime::kind` to match. I suspect this
field used to have the type `LifetimeRes` and then the type was changed
but the field name remained the same.
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Rollup of 17 pull requests
Successful merges:
- #138374 (Enable contracts for const functions)
- #138380 (ci: add runners for vanilla LLVM 20)
- #138393 (Allow const patterns of matches to contain pattern types)
- #139517 (std: sys: process: uefi: Use NULL stdin by default)
- #139554 (std: add Output::exit_ok)
- #139660 (compiletest: Add an experimental new executor to replace libtest)
- #139669 (Overhaul `AssocItem`)
- #139671 (Proc macro span API redesign: Replace proc_macro::SourceFile by Span::{file, local_file})
- #139750 (std/thread: Use default stack size from menuconfig for NuttX)
- #139772 (Remove `hir::Map`)
- #139785 (Let CStrings be either 1 or 2 byte aligned.)
- #139789 (do not unnecessarily leak auto traits in item bounds)
- #139791 (drop global where-bounds before merging candidates)
- #139798 (normalize: prefer `ParamEnv` over `AliasBound` candidates)
- #139822 (Fix: Map EOPNOTSUPP to ErrorKind::Unsupported on Unix)
- #139833 (Fix some HIR pretty-printing problems)
- #139836 (Basic tests of MPMC receiver cloning)
r? `@ghost`
`@rustbot` modify labels: rollup
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Overhaul `AssocItem`
`AssocItem` has multiple fields that only make sense some of the time. E.g. the `name` can be empty if it's an RPITIT associated type. It's clearer and less error prone if these fields are moved to the relevant `kind` variants.
r? ``@fee1-dead``
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r=compiler-errors,oli-obk,RalfJung
Enable contracts for const functions
Use `const_eval_select!()` macro to enable contract checking only at runtime. The existing contract logic relies on closures, which are not supported in constant functions.
This commit also removes one level of indirection for ensures clauses since we no longer build a closure around the ensures predicate.
Resolves #136925
**Call-out:** This is still a draft PR since CI is broken due to a new warning message for unreachable code when the bottom of the function is indeed unreachable. It's not clear to me why the warning wasn't triggered before.
r? ```@compiler-errors```
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To accurately reflect that RPITIT assoc items don't have a name. This
avoids the use of `kw::Empty` to mean "no name", which is error prone.
Helps with #137978.
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Because all the other similar methods are on `AssocItem`.
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From `hir::AssocItem`.
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`hir::AssocItem` currently has a boolean `fn_has_self_parameter` field,
which is misplaced, because it's only relevant for associated fns, not
for associated consts or types. This commit moves it (and renames it) to
the `AssocKind::Fn` variant, where it belongs.
This requires introducing a new C-style enum, `AssocTag`, which is like
`AssocKind` but without the fields. This is because `AssocKind` values
are passed to various functions like `find_by_ident_and_kind` to
indicate what kind of associated item should be searched for, and having
to specify `has_self` isn't relevant there.
New methods:
- Predicates `AssocItem::is_fn` and `AssocItem::is_method`.
- `AssocItem::as_tag` which converts `AssocItem::kind` to `AssocTag`.
Removed `find_by_name_and_kinds`, which is unused.
`AssocItem::descr` can now distinguish between methods and associated
functions, which slightly improves some error messages.
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nnethercote:rm-Nonterminal-and-TokenKind-Interpolated, r=petrochenkov
Remove `Nonterminal` and `TokenKind::Interpolated`
A third attempt at this; the first attempt was #96724 and the second was #114647.
r? `@ghost`
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add `core::intrinsics::simd::{simd_extract_dyn, simd_insert_dyn}`
fixes https://github.com/rust-lang/rust/issues/137372
adds `core::intrinsics::simd::{simd_extract_dyn, simd_insert_dyn}`, which contrary to their non-dyn counterparts allow a non-const index. Many platforms (but notably not x86_64 or aarch64) have dedicated instructions for this operation, which stdarch can emit with this change.
Future work is to also make the `Index` operation on the `Simd` type emit this operation, but the intrinsic can't be used directly. We'll need some MIR shenanigans for that.
r? `@ghost`
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Rename some `name` variables as `ident`.
It bugs me when variables of type `Ident` are called `name`. It leads to silly things like `name.name`. `Ident` variables should be called `ident`, and `name` should be used for variables of type `Symbol`.
This commit improves things by by doing `s/name/ident/` on a bunch of `Ident` variables. Not all of them, but a decent chunk.
r? `@fee1-dead`
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Remove some dead or leftover code related to rustc-intrinsic abi removal
r? ```@RalfJung```
PR that removed the ABI: https://github.com/rust-lang/rust/pull/139455
tracking issue: https://github.com/rust-lang/rust/issues/132735
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It bugs me when variables of type `Ident` are called `name`. It leads to
silly things like `name.name`. `Ident` variables should be called
`ident`, and `name` should be used for variables of type `Symbol`.
This commit improves things by by doing `s/name/ident/` on a bunch of
`Ident` variables. Not all of them, but a decent chunk.
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Rollup of 10 pull requests
Successful merges:
- #139494 (Restrict some queries by def-kind more)
- #139496 (Revert r-a changes of rust-lang/rust#139455)
- #139506 (add missing word in doc comment (part 2))
- #139515 (Improve presentation of closure signature mismatch from `Fn` trait goal)
- #139520 (compiletest maintenance: sort deps and drop dep on `anyhow`)
- #139523 (Rustc dev guide subtree update)
- #139526 (Fix deprecation note for std::intrinsics)
- #139528 (compiletest: Remove the `--logfile` flag)
- #139541 (Instantiate higher-ranked transmute goal w/ placeholders before emitting sub-obligations)
- #139547 (Update library tracking issue template to set S-tracking-unimplemented)
r? `@ghost`
`@rustbot` modify labels: rollup
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Rollup of 7 pull requests
Successful merges:
- #139476 (rm `RegionInferenceContext::var_infos`)
- #139485 (compiletest: Stricter parsing for diagnostic kinds)
- #139491 (Update books)
- #139500 (document panic behavior of Vec::resize and Vec::resize_with)
- #139501 (Fix stack overflow in exhaustiveness due to recursive HIR opaque hidden types)
- #139504 (add missing word in doc comment)
- #139509 (clean: remove Deref<Target=RegionKind> impl for Region and use `.kind()`)
r? `@ghost`
`@rustbot` modify labels: rollup
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Restrict some queries by def-kind more
Random cleanup. I prefer things to assert more so as to catch bugs :)
r? oli-obk
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Invert the order that we pass the arguments to the
`contract_check_ensures` function to avoid the warning when the tail
of the function is unreachable.
Note that the call itself is also unreachable, but we have already
handled that case by ignoring unreachable call for contract calls.
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