In `report_fullfillment_errors` push back `T: Sized`, `T: WellFormed`
and coercion errors to the end of the list. The pre-existing
deduplication logic eliminates redundant errors better that way, keeping
the resulting output with fewer errors than before, while also having
more detail.
```
error: expected one of `,`, `:`, or `}`, found `.`
--> $DIR/missing-fat-arrow.rs:25:14
|
LL | Some(a) if a.value == b {
| - while parsing this struct
LL | a.value = 1;
| -^ expected one of `,`, `:`, or `}`
| |
| while parsing this struct field
|
help: try naming a field
|
LL | a: a.value = 1;
| ++
help: you might have meant to start a match arm after the match guard
|
LL | Some(a) if a.value == b => {
| ++
```
Fix#78585.
coverage: Allow each coverage statement to have multiple code regions
The original implementation of coverage instrumentation was built around the assumption that a coverage counter/expression would be associated with *up to one* code region. When it was discovered that *multiple* regions would sometimes need to share a counter, a workaround was found: for the remaining regions, the instrumentor would create a fresh expression that adds zero to the existing counter/expression.
That got the job done, but resulted in some awkward code, and produces unnecessarily complicated coverage maps in the final binary.
---
This PR removes that tension by changing `StatementKind::Coverage`'s code region field from `Option<CodeRegion>` to `Vec<CodeRegion>`.
The changes on the codegen side are fairly straightforward. As long as each `CoverageKind::Counter` only injects one `llvm.instrprof.increment`, the rest of coverage codegen is happy to handle multiple regions mapped to the same counter/expression, with only minor option-to-vec adjustments.
On the instrumentor/mir-transform side, we can get rid of the code that creates extra (x + 0) expressions. Instead we gather all of the code regions associated with a single BCB, and inject them all into one coverage statement.
---
There are several patches here but they can be divided in to three phases:
- Preparatory work
- Actually switching over to multiple regions per coverage statement
- Cleaning up
So viewing the patches individually may be easier.
non_lifetime_binders: fix ICE in lint opaque-hidden-inferred-bound
Opaque types like `impl for<T> Trait<T>` would previously lead to an ICE.
r? `@compiler-errors`
a small wf and clause cleanup
- remove `Clause::from_projection_clause`, instead use `ToPredicate`
- change `predicate_obligations` to directly take a `Clause`
- remove some unnecessary `&`
- use clause in `min_specialization` checks where easily applicable
Suggest `pin!()` instead of `Pin::new()` when appropriate
When encountering a type that needs to be pinned but that is `!Unpin`, suggest using the `pin!()` macro.
Fix#57994.
Rollup of 5 pull requests
Successful merges:
- #115863 (Add check_unused_messages in tidy)
- #116210 (Ensure that `~const` trait bounds on associated functions are in const traits or impls)
- #116358 (Rename both of the `Match` relations)
- #116371 (Remove unused features from `rustc_llvm`.)
- #116374 (Print normalized ty)
r? `@ghost`
`@rustbot` modify labels: rollup
Print normalized ty
Inside `mir_assign_valid_types` we are comparing normalized type of `mir_place` but in debug message we are not printing the normalized value, this changes that.
It was added in #78569. It's complicated and doesn't actually help
performance.
Also, add a comment explaining why the two `alloc_from_iter` functions
are so different.
Don't suggest nonsense suggestions for unconstrained type vars in `note_source_of_type_mismatch_constraint`
The way we do type inference for suggestions in `note_source_of_type_mismatch_constraint` is a bit strange. We compute the "ideal" method signature, which takes the receiver that we *want* and uses it to compute the types of the arguments that would have given us that receiver via type inference, and use *that* to suggest how to change an argument to make sure our receiver type is inferred correctly.
The problem is that sometimes we have totally unconstrained arguments (well, they're constrained by things outside of the type checker per se, like associated types), and therefore type suggestions are happy to coerce anything to that unconstrained argument. This leads to bogus suggestions, like #116155. This is partly due to above, and partly due to the fact that `emit_type_mismatch_suggestions` doesn't double check that its suggestions are actually compatible with the program other than trying to satisfy the type mismatch.
This adds a hack to make sure that at least the types are fully constrained, but I guess I could also rip out this logic altogether. There would be some sad diagnostics regressions though, such as `tests/ui/type/type-check/point-at-inference-4.rs`.
Fixes#116155
