Move placeholder error handling to before region inference#142623

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amandasystems wants to merge 11 commits intorust-lang:mainfrom

amandasystems:early-placeholder-errors

Commits on Jan 15, 2026

Move handling of placeholder errors to before region inference
amandasystems
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Remove expected duplicate errors in UI tests
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tests/ui/higher-ranked/higher-ranked-lifetime-equality.rsests/ui/higher-ranked/higher-ranked-lifetime-equality.rs: remove literally idential error.
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tests/ui/higher-ranked/subtype/hr-subtype.rs: remove redundant error
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higher-ranked/trait-bounds/hrtb-conflate-regions.rs: remove redundant "not general enough"
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tests/ui/lub-glb/old-lub-glb-object.rs: remove literally identical error
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tests/ui/nll/relate_tys/hr-fn-aau-eq-abu.rs: remove literally identical "one type is more general"
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impl-trait/nested-rpit-hrtb.rs: add an extra "lifetime may not live long enough"
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These explicitly marked as such duplicate errors are gone too
amandasystems
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Removed redundant error, placeholders move around a bit
amandasystems
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Missing note about limitations in the borrow checker
amandasystems
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