Fix incorrect Box::pin suggestion #89390
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| | | expected `&dyn Trait`, found struct `Box` | ||
| | | help: consider borrowing here: `&x` | ||
| | ---------- ^ expected `&dyn Trait`, found struct `Box` | ||
| | | |
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Do we have positive tests for these where the type involved can be coerced and the suggestion occurs?
r=me with either an answer or a new test (to avoid regressions there, I'm on the road right now or I'd check myself)
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Looks like yep, ui/inference/deref-suggestion
The suggestion checked if Pin<Box<T>> could be coeerced to the expected type, but did not check predicates created by the coercion. We now look for predicates that definitely cannot be satisfied before giving the suggestion. The suggestion is marked MaybeIncorrect because we allow predicates that are still ambiguous and can't be proven.
This only changed two tests and I consider both changes an improvement.
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Fix incorrect Box::pin suggestion The suggestion checked if `Pin<Box<T>>` could be coeerced to the expected type, but did not check predicates created by the coercion. We now look for predicates that definitely cannot be satisfied before giving the suggestion. The suggestion is still marked MaybeIncorrect because we allow predicates that are still ambiguous and can't be proven. Fixes rust-lang#72117.
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…askrgr Rollup of 6 pull requests Successful merges: - rust-lang#89390 (Fix incorrect Box::pin suggestion) - rust-lang#89433 (Fix ctrl-c causing reads of stdin to return empty on Windows.) - rust-lang#89823 (Switch order of terms to prevent overflow) - rust-lang#89865 (Allow static linking LLVM with ThinLTO) - rust-lang#89873 (Add missing word to `FromStr` trait documentation) - rust-lang#89878 (Fix missing remaining compiler specific cfg information) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Suggest Box::pin when Pin::new is used instead This fixes an incorrect diagnostic. **Based on rust-lang#89390**; only the last commit is specific to this PR. "Ignore whitespace changes" also helps here.
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The suggestion checked if
Pin<Box<T>>could be coeerced to the expectedtype, but did not check predicates created by the coercion. We now
look for predicates that definitely cannot be satisfied before giving
the suggestion.
The suggestion is still marked MaybeIncorrect because we allow predicates that
are still ambiguous and can't be proven.
Fixes #72117.