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Warn about dead tuple struct fields
Continuation of #92972. Fixes #92790.
The language team has already commented on this in https://github.com/rust-lang/rust/pull/92972#issuecomment-1021511970; I have incorporated their requests here. Specifically, there is now a new allow-by-default `unused_tuple_struct_fields` lint (name bikesheddable), and fields of unit type are ignored (https://github.com/rust-lang/rust/pull/92972#issuecomment-1021815408), so error messages look like this:
```
error: field is never read: `1`
--> $DIR/tuple-struct-field.rs:6:21
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LL | struct Wrapper(i32, [u8; LEN], String);
| ^^^^^^^^^
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help: change the field to unit type to suppress this warning while preserving the field numbering
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LL | struct Wrapper(i32, (), String);
| ~~
```
r? `@joshtriplett`
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Suggest adding a `?Sized` bound if appropriate on E0599 by inspecting
the HIR Generics. (Fix #98539)
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Signed-off-by: Yuki Okushi <jtitor@2k36.org>
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r=compiler-errors
Point to type parameter definition when not finding variant, method and associated item
fixes #77391
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use `def_ident_span` , `body_owner_def_id` instead of `in_progress_typeck_results`, `guess_head_span`
use `body_id.owner` directly
add description to label
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r=compiler-errors
Suggest derivable trait on E0277 error
Closes https://github.com/rust-lang/rust/issues/95099 .
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When encountering an unsatisfied trait bound, if there are no other
suggestions, mention all the types that *do* implement that trait:
```
error[E0277]: the trait bound `f32: Foo` is not satisfied
--> $DIR/impl_wf.rs:22:6
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LL | impl Baz<f32> for f32 { }
| ^^^^^^^^ the trait `Foo` is not implemented for `f32`
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= help: the following other types implement trait `Foo`:
Option<T>
i32
str
note: required by a bound in `Baz`
--> $DIR/impl_wf.rs:18:31
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LL | trait Baz<U: ?Sized> where U: Foo { }
| ^^^ required by this bound in `Baz`
```
Mention implementers of traits in `ImplObligation`s.
Do not mention other `impl`s for closures, ranges and `?`.
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Instead of probing for all possible impls that could have caused an
`ImplObligation`, keep track of its `DefId` and obligation spans for
accurate error reporting.
Follow up to #89580. Addresses #89418.
Remove some unnecessary clones.
Tweak output for auto trait impl obligations.
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Building a dozen separate regexps for each test in compiletest consumes significant amounts of CPU cycles.
Using `RUSTC_FORCE_INCR_COMP_ARTIFACT_HEADER` stabilizes hashes calcuated for the individual tests so
no test-dependent normalization is needed. Hashes for the standard library still change so some
normalizations are still needed.
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Replace use of `ty()` on term and use it in more places. This will allow more flexibility in the
future, but slightly worried it allows items which are consts which only accept types.
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Normalize symbol hashes in compiletest.
Remove DefId sorting
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* Point at RHS of associated type in obligation span
* Point at `impl` assoc type on projection error
* Reduce verbosity of recursive obligations
* Point at source of binding lifetime obligation
* Tweak "required bound" note
* Tweak "expected... found opaque (return) type" labels
* Point at set type in impl assoc type WF errors
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Group obligations by `impl` block that introduced them.
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Be more thorough in using `ItemObligation` and `BindingObligation` when
evaluating obligations so that we can point at trait bounds that
introduced unfulfilled obligations. We no longer incorrectly point at
unrelated trait bounds (`substs-ppaux.verbose.stderr`).
In particular, we now point at trait bounds on method calls.
We no longer point at "obvious" obligation sources (we no longer have a
note pointing at `Trait` saying "required by a bound in `Trait`", like
in `associated-types-no-suitable-supertrait*`).
Address part of #89418.
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When encountering a binop where the types would have been accepted, if
all the predicates had been fulfilled, include information about the
predicates and suggest appropriate `#[derive]`s if possible.
Point at trait(s) that needs to be `impl`emented.
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Correctly handle supertraits for min_specialization
Supertraits of specialization markers could circumvent checks for
min_specialization. Elaborating predicates prevents this.
r? ````@nikomatsakis````
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A subset of places referred to 'super-trait', so this changes them
to all use 'supertrait'. This matches 'supertype' and some other
usages. An exception is 'auto-trait' which is consistently used
in that manner.
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Supertraits of specialization markers could circumvent checks for
min_specialization. Elaborating predicates prevents this.
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:sparkles:
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* On suggestions that include deletions, use a diff inspired output format
* When suggesting addition, use `+` as underline
* Color highlight modified span
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This reverts commit 715c68fe90c6f1d0b3004ad18f16e0811f209992.
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This reverts commit c76b1b031753fc08a18a3906d828683476c1e595.
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warn-by-default on 2015
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Add more info for common trait resolution and async/await errors
* Suggest `Pin::new`/`Box::new`/`Arc::new`/`Box::pin` in more cases
* Point at `impl` and type defs introducing requirements on E0277
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give full path of constraint in suggest_constraining_type_param
close https://github.com/rust-lang/rust/issues/83513
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Add a regression test for issue-68830
Closes #68830
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