prevent opaque types from appearing in impl headers #95973
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Co-authored-by: Michael Goulet <michael@errs.io> Co-authored-by: Rémy Rakic <remy.rakic+github@gmail.com>
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Rollup of 7 pull requests Successful merges: - rust-lang#95316 (Rustdoc: Discriminate required and provided associated constants and types) - rust-lang#95405 (Move name resolution logic to a dedicated file) - rust-lang#95914 (Implement tuples using recursion) - rust-lang#95918 (Delay a bug when we see SelfCtor in ref pattern) - rust-lang#95970 (Fix suggestions in case of `T:` bounds) - rust-lang#95973 (prevent opaque types from appearing in impl headers) - rust-lang#95986 (Autolabel library PRs with T-libs) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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cc @lqd
opaque types are not distinguishable from their hidden type at the codegen stage. So we could either end up with cases where the hidden type doesn't implement the trait (which will thus ICE) or where the hidden type does implement the trait (so we'd be using its impl instead of the one written for the opaque type). This can even lead to unsound behaviour without unsafe code.
Fixes #86411.
Fixes #84660.
rebase of #87382 plus some diagnostic tweaks