Replace parent substs of associated types with inference vars in borrow checker #85755
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Normalization can pull in named regions from the parameter environment. We need to be prepared for that in the opaque types code.
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📌 Commit 09eed28 has been approved by |
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nominating and insta-accepting for beta backport since #83190 is still happening on beta |
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This patch is already included in beta |
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Fixes #83190
Fixes #78450
When we normalize an associated type that refers to an opaque type, it can happen that the substs of the associated type do not occur in the projection (they are parent substs). We previously didn't replace those substs with inference vars, which left a concrete region after all regions should have already been replaced with inference vars and triggered a
delay_span_bug. After we normalize the opaque type, we now try to replace any remaining concrete regions with inference vars.