[WIP] Diagnose elision failure on the AST #96575
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The extra diagnostics come from the compiler no longer aborting before typeck.
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cjgillot
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Apr 30, 2022
cjgillot
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Apr 30, 2022
| visit::walk_ty(self, ty) | ||
| } | ||
| TyKind::ImplTrait(..) => { | ||
| if let AnonymousLifetimeRib::PassThrough(_) = |
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This will be corrected to a test on universal/existential impl-trait.
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☔ The latest upstream changes (presumably #95776) made this pull request unmergeable. Please resolve the merge conflicts. |
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Turns out this is not fully cooked yet. |
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Based on #95776 and #96559.
This PR moves the elision failure diagnostics ("expected named lifetime") from HIR to the AST.
This is is done by introducing a pair of functions
resolve_fn_like_elisionwhich handles ribs for functions andelision_lifetimewhich resolve parameters and return the proper lifetime for elision.I am not very confident in the elision logic: the currently implemented code allows a few more cases than is specified in the documentation. For instance, this is allowed:
This PR is WIP since its handling of impl-trait is a bit ad-hoc until #96529 is resolved.