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r=compiler-errors
Imply outlives-bounds on lazy type aliases
Fixes #118479.
r? types
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Replace a number of FxHashMaps/Sets with stable-iteration-order alternatives
This PR replaces almost all of the remaining `FxHashMap`s in query results with either `FxIndexMap` or `UnordMap`. The only case that is missing is the `EffectiveVisibilities` struct which turned out to not be straightforward to transform. Once that is done too, we can remove the `HashStable` implementation from `HashMap`.
The first commit adds the `StableCompare` trait which is a companion trait to `StableOrd`. Some types like `Symbol` can be compared in a cross-session stable way, but their `Ord` implementation is not stable. In such cases, a `StableCompare` implementation can be provided to offer a lightweight way for stable sorting. The more heavyweight option is to sort via `ToStableHashKey`, but then sorting needs to have access to a stable hashing context and `ToStableHashKey` can also be expensive as in the case of `Symbol` where it has to allocate a `String`.
The rest of the commits are rather mechanical and don't overlap, so they are best reviewed individually.
Part of [MCP 533](https://github.com/rust-lang/compiler-team/issues/533).
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Cleanup error handlers: round 5
More rustc_errors cleanups. A sequel to https://github.com/rust-lang/rust/pull/119171.
r? ````@compiler-errors````
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Tweak suggestions for bare trait used as a type
```
error[E0782]: trait objects must include the `dyn` keyword
--> $DIR/not-on-bare-trait-2021.rs:11:11
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LL | fn bar(x: Foo) -> Foo {
| ^^^
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help: use a generic type parameter, constrained by the trait `Foo`
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LL | fn bar<T: Foo>(x: T) -> Foo {
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help: you can also use `impl Foo`, but users won't be able to specify the type paramer when calling the `fn`, having to rely exclusively on type inference
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LL | fn bar(x: impl Foo) -> Foo {
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help: alternatively, use a trait object to accept any type that implements `Foo`, accessing its methods at runtime using dynamic dispatch
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LL | fn bar(x: &dyn Foo) -> Foo {
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error[E0782]: trait objects must include the `dyn` keyword
--> $DIR/not-on-bare-trait-2021.rs:11:19
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LL | fn bar(x: Foo) -> Foo {
| ^^^
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help: use `impl Foo` to return an opaque type, as long as you return a single underlying type
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LL | fn bar(x: Foo) -> impl Foo {
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help: alternatively, you can return an owned trait object
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LL | fn bar(x: Foo) -> Box<dyn Foo> {
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```
Fix #119525:
```
error[E0038]: the trait `Ord` cannot be made into an object
--> $DIR/bare-trait-dont-suggest-dyn.rs:3:33
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LL | fn ord_prefer_dot(s: String) -> Ord {
| ^^^ `Ord` cannot be made into an object
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note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
--> $SRC_DIR/core/src/cmp.rs:LL:COL
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= note: the trait cannot be made into an object because it uses `Self` as a type parameter
::: $SRC_DIR/core/src/cmp.rs:LL:COL
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= note: the trait cannot be made into an object because it uses `Self` as a type parameter
help: consider using an opaque type instead
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LL | fn ord_prefer_dot(s: String) -> impl Ord {
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```
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Match guards with an if let guard or an if let chain guard should have a
temporary scope of the whole arm. This is to allow ref bindings to
temporaries to borrow check.
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Use Expr instead. Use `ExprKind::Let` to represent if let guards.
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Reorder check_item_type diagnostics so they occur next to the corresponding `check_well_formed` diagnostics
The first commit is just a cleanup.
The second commit moves most checks from `check_mod_item_types` into `check_well_formed`, invoking the checks in lockstep per-item instead of iterating over all items twice.
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query stable
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Fix #119525.
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Add the following suggestions:
```
error[E0782]: trait objects must include the `dyn` keyword
--> $DIR/not-on-bare-trait-2021.rs:11:11
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LL | fn bar(x: Foo) -> Foo {
| ^^^
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help: use a generic type parameter, constrained by the trait `Foo`
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LL | fn bar<T: Foo>(x: T) -> Foo {
| ++++++++ ~
help: you can also use `impl Foo`, but users won't be able to specify the type paramer when calling the `fn`, having to rely exclusively on type inference
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LL | fn bar(x: impl Foo) -> Foo {
| ++++
help: alternatively, use a trait object to accept any type that implements `Foo`, accessing its methods at runtime using dynamic dispatch
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LL | fn bar(x: &dyn Foo) -> Foo {
| ++++
error[E0782]: trait objects must include the `dyn` keyword
--> $DIR/not-on-bare-trait-2021.rs:11:19
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LL | fn bar(x: Foo) -> Foo {
| ^^^
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help: use `impl Foo` to return an opaque type, as long as you return a single underlying type
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LL | fn bar(x: Foo) -> impl Foo {
| ++++
help: alternatively, you can return an owned trait object
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LL | fn bar(x: Foo) -> Box<dyn Foo> {
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```
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Don't synthesize host effect params for trait associated functions marked const
Fixes #113378.
r? fee1-dead or compiler
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`Diagnostic` has 40 methods that return `&mut Self` and could be
considered setters. Four of them have a `set_` prefix. This doesn't seem
necessary for a type that implements the builder pattern. This commit
removes the `set_` prefixes on those four methods.
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corresponding `check_well_formed` diagnostics
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No reason why this needs to be a `bug!()`.
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Signed-off-by: cuishuang <imcusg@gmail.com>
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Make closures carry their own ClosureKind
Right now, we use the "`movability`" field of `hir::Closure` to distinguish a closure and a coroutine. This is paired together with the `CoroutineKind`, which is located not in the `hir::Closure`, but the `hir::Body`. This is strange and redundant.
This PR introduces `ClosureKind` with two variants -- `Closure` and `Coroutine`, which is put into `hir::Closure`. The `CoroutineKind` is thus removed from `hir::Body`, and `Option<Movability>` no longer needs to be a stand-in for "is this a closure or a coroutine".
r? eholk
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r=compiler-errors
Remove `DiagCtxt` API duplication
`DiagCtxt` defines the internal API for creating and emitting diagnostics: methods like `struct_err`, `struct_span_warn`, `note`, `create_fatal`, `emit_bug`. There are over 50 methods.
Some of these methods are then duplicated across several other types: `Session`, `ParseSess`, `Parser`, `ExtCtxt`, and `MirBorrowckCtxt`. `Session` duplicates the most, though half the ones it does are unused. Each duplicated method just calls forward to the corresponding method in `DiagCtxt`. So this duplication exists to (in the best case) shorten chains like `ecx.tcx.sess.parse_sess.dcx.emit_err()` to `ecx.emit_err()`.
This API duplication is ugly and has been bugging me for a while. And it's inconsistent: there's no real logic about which methods are duplicated, and the use of `#[rustc_lint_diagnostic]` and `#[track_caller]` attributes vary across the duplicates.
This PR removes the duplicated API methods and makes all diagnostic creation and emission go through `DiagCtxt`. It also adds `dcx` getter methods to several types to shorten chains. This approach scales *much* better than API duplication; indeed, the PR adds `dcx()` to numerous types that didn't have API duplication: `TyCtxt`, `LoweringCtxt`, `ConstCx`, `FnCtxt`, `TypeErrCtxt`, `InferCtxt`, `CrateLoader`, `CheckAttrVisitor`, and `Resolver`. These result in a lot of changes from `foo.tcx.sess.emit_err()` to `foo.dcx().emit_err()`. (You could do this with more types, but it gets into diminishing returns territory for types that don't emit many diagnostics.)
After all these changes, some call sites are more verbose, some are less verbose, and many are the same. The total number of lines is reduced, mostly because of the removed API duplication. And consistency is increased, because calls to `emit_err` and friends are always preceded with `.dcx()` or `.dcx`.
r? `@compiler-errors`
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Do not fetch HIR in inferred_outlives_of.
Small simplification allowed by https://github.com/rust-lang/rust/pull/119248
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from movability
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Give temporaries in if let guards correct scopes
Temporaries in if-let guards have scopes that escape the match arm, this causes problems because the drops might be for temporaries that are not storage live. This PR changes the scope of temporaries in if-let guards to be limited to the arm:
```rust
_ if let Some(s) = std::convert::identity(&Some(String::new())) => {}
// Temporary for Some(String::new()) is dropped here ^
```
We also now deduplicate temporaries between copies of the guard created for or-patterns:
```rust
// Only create a single Some(String::new()) temporary variable
_ | _ if let Some(s) = std::convert::identity(&Some(String::new())) => {}
```
This changes MIR building to pass around `ExprId`s rather than `Expr`s so that we have a way to index different expressions.
cc #51114
Closes #116079
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Also add some `dcx` methods to types that wrap `TyCtxt`, for easier
access.
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remove dead inferred outlives testing code
The `test_inferred_outlives` function was never run, because the code that's actually used for the tests was part of the `inferred_outlives_of` query, which ran before `test_inferred_outlives` during type collecting. This PR separates the test code from the query and moves it inside the dedicated function.
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Clean up `check_consts` and misc fixes
1. Remove most of the logic around erroring with trait methods. I have kept the part resolving it to a concrete impl, as that is used for const stability checks.
2. Turning on `effects` causes ICE with generic args, due to `~const Tr` when `Tr` is not `#[const_trait]` tripping up expectation in code that handles generic args, more specifically here:
https://github.com/rust-lang/rust/blob/8681e077b8afa99d60acf8f8470a012a3ce709a5/compiler/rustc_hir_analysis/src/astconv/generics.rs#L377
We set `arg_count.correct` to `Err` to correctly signal that an error has already been reported.
3. UI test blesses.
Edit(fmease): Fixes #117244 (UI test is in #119099 for now).
r? compiler-errors
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`IntoDiagnostic` defaults to `ErrorGuaranteed`, because errors are the
most common diagnostic level. It makes sense to do likewise for the
closely-related (and much more widely used) `DiagnosticBuilder` type,
letting us write `DiagnosticBuilder<'a, ErrorGuaranteed>` as just
`DiagnosticBuilder<'a>`. This cuts over 200 lines of code due to many
multi-line things becoming single line things.
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Emits error if has bound regions
Fixes #119209
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Fix `EmissionGuarantee`
There are some problems with the `DiagCtxt` API related to `EmissionGuarantee`. This PR fixes them.
r? `@compiler-errors`
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- Make temporaries in if-let guards be the same variable in MIR when
the guard is duplicated due to or-patterns.
- Change the "destruction scope" for match arms to be the arm scope rather
than the arm body scope.
- Add tests.
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r=compiler-errors
Give `VariantData::Struct` named fields, to clairfy `recovered`.
Implements https://github.com/rust-lang/rust/pull/119121#discussion_r1431467066. Supersedes #119121
This way, it's clear what the bool fields means, instead of having to find where it's generated. Changes both ast and hir.
r? `@compiler-errors`
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r=fee1-dead
effects: fix a comment
r? fee1-dead or compiler
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Check generic params after sigature for main-fn-ty
Fixes #118772
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And make all hand-written `IntoDiagnostic` impls generic, by using
`DiagnosticBuilder::new(dcx, level, ...)` instead of e.g.
`dcx.struct_err(...)`.
This means the `create_*` functions are the source of the error level.
This change will let us remove `struct_diagnostic`.
Note: `#[rustc_lint_diagnostics]` is added to `DiagnosticBuilder::new`,
it's necessary to pass diagnostics tests now that it's used in
`into_diagnostic` functions.
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