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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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use Vec for region constraints instead of BTreeMap
~1% perf gain
Diagnostic regressions need more investigation.
r? `@ghost`
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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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-Znext-solver: adapt overflow rules to avoid breakage
Do not erase overflow constraints if they are from equating the impl header when normalizing[^1].
This should be the minimal change to not break crates depending on the old project behavior of "apply impl constraints while only lazily evaluating any nested goals".
Fixes https://github.com/rust-lang/trait-system-refactor-initiative/issues/70, see https://hackmd.io/ATf4hN0NRY-w2LIVgeFsVg for the reasoning behind this.
Only keeping constraints on overflow for `normalize-to` goals as that's the only thing needed for backcompat. It also allows us to not track the origin of root obligations. The issue with root goals would be something like the following:
```rust
trait Foo {}
trait Bar {}
trait FooBar {}
impl<T: Foo + Bar> FooBar for T {}
// These two should behave the same, rn we can drop constraints for both,
// but if we don't drop `Misc` goals we would only drop the constraints for
// `FooBar` unless we track origins of root obligations.
fn func1<T: Foo + Bar>() {}
fn func2<T: FooBaz>() {}
```
[^1]: mostly, the actual rules are slightly different
r? ``@compiler-errors``
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structural relations
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r=lcnr
Use alias-eq in structural normalization
We don't need to register repeated normalizes-to goals in a loop in structural normalize, but instead we can piggyback on the fact that alias-eq will already normalize aliases until they are rigid.
This fixes rust-lang/trait-system-refactor-initiative#78.
r? lcnr
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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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Remove unnecessary constness from ProjectionCandidate
Constness in an item bound will be represented by an effect param, so no need to record constness here.
r? fee1-dead
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don't fold ParamEnv in register_predicate_obligation
\>5% perf gain for diesel!
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NFC don't convert types to identical types
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Remove an unneeded allocation
This removes an unneeded allocation in `<&[hir::GenericParam<'_>] as NextTypeParamName>::next_type_param_name`
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Don't pass lint back out of lint decorator
Change the decorator function in the signature of the `emit_lint`/`span_lint`/etc family of methods from `impl for<'a, 'b> FnOnce(&'b mut DiagnosticBuilder<'a, ()>) -> &'b mut DiagnosticBuilder<'a, ()>` to `impl for<'a, 'b> FnOnce(&'b mut DiagnosticBuilder<'a, ()>)`. I consider it easier to read this way, especially when there's control flow involved.
r? nnethercote though feel free to reassign
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Collect lang items from AST, get rid of `GenericBound::LangItemTrait`
r? `@cjgillot`
cc #115178
Looking forward, the work to remove `QPath::LangItem` will also be significantly more difficult, but I plan on doing it as well. Specifically, we have to change:
1. A lot of `rustc_ast_lowering` for things like expr `..`
2. A lot of astconv, since we actually instantiate lang and non-lang paths quite differently.
3. A ton of diagnostics and clippy lints that are special-cased via `QPath::LangItem`
Meanwhile, it was pretty easy to remove `GenericBound::LangItemTrait`, so I just did that here.
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cache param env canonicalization
Canonicalize ParamEnv only once and store it. Then whenever we try to canonicalize `ParamEnvAnd<'tcx, T>` we only have to canonicalize `T` and then merge the results.
Prelimiary results show ~3-4% savings in diesel and serde benchmarks.
Best to review commits individually. Some commits have a short description.
Initial implementation had a soundness bug (https://github.com/rust-lang/rust/pull/117749#issuecomment-1840453387) due to cache invalidation:
- When canonicalizing `Ty<'?0>` we first try to resolve region variables in the current InferCtxt which may have a constraint `?0 == 'static`. This means that we register `Ty<'?0> => Canonical<Ty<'static>>` in the cache, which is obviously incorrect in another inference context.
- This is fixed by not doing region resolution when canonicalizing the query *input* (vs. response), which is the only place where ParamEnv is used, and then in a later commit we *statically* guard against any form of inference variable resolution of the cached canonical ParamEnv's.
r? `@ghost`
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When shortening types and writing them to disk, make `short_ty_string`
capable of reusing the same file, instead of writing a file per
shortened type.
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Move some methods from `tcx.hir()` to `tcx`
https://github.com/rust-lang/rust/pull/118256#issuecomment-1826442834
Renamed:
- find -> opt_hir_node
- get -> hir_node
- find_by_def_id -> opt_hir_node_by_def_id
- get_by_def_id -> hir_node_by_def_id
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more clippy::complexity fixes
redundant_guards
redundant_slicing
filter_next
needless_borrowed_reference
useless_format
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clippy::complexity fixes
filter_map_identity
needless_bool
search_is_some
unit_arg
map_identity
needless_question_mark
derivable_impls
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redundant_guards
redundant_slicing
filter_next
needless_borrowed_reference
useless_format
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filter_map_identity
needless_bool
search_is_some
unit_arg
map_identity
needless_question_mark
derivable_impls
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Rollup of 9 pull requests
Successful merges:
- #116740 (dont ICE when ConstKind::Expr for is_const_evaluatable)
- #117914 (On borrow return type, suggest borrowing from arg or owned return type)
- #117927 (Clarify how to choose a FutureIncompatibilityReason variant.)
- #118855 (Improve an error involving attribute values.)
- #118856 (rustdoc-search: clean up parser)
- #118865 (rustc_codegen_llvm: Enforce `rustc::potential_query_instability` lint)
- #118866 (llvm-wrapper: adapt for LLVM API change)
- #118868 (Correctly gate the parsing of match arms without body)
- #118877 (tests: CGU tests require build-pass, not check-pass (remove FIXME))
r? `@ghost`
`@rustbot` modify labels: rollup
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lenko-d:const_evaluatable_failed_for_non_unevaluated_const, r=BoxyUwU
dont ICE when ConstKind::Expr for is_const_evaluatable
The problem is that we are not handling ConstKind::Expr inside report_not_const_evaluatable_error
Fixes [#114151]
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Renamings:
- find -> opt_hir_node
- get -> hir_node
- find_by_def_id -> opt_hir_node_by_def_id
- get_by_def_id -> hir_node_by_def_id
Fix rebase changes using removed methods
Use `tcx.hir_node_by_def_id()` whenever possible in compiler
Fix clippy errors
Fix compiler
Apply suggestions from code review
Co-authored-by: Vadim Petrochenkov <vadim.petrochenkov@gmail.com>
Add FIXME for `tcx.hir()` returned type about its removal
Simplify with with `tcx.hir_node_by_def_id`
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r=compiler-errors
Restore `const PartialEq`
And thus fixes a number of tests. There is a bug that still needs to be fixed, so WIP for now.
r? `@compiler-errors`
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detects redundant imports that can be eliminated.
for #117772 :
In order to facilitate review and modification, split the checking code and
removing redundant imports code into two PR.
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