Remove the synthetic "region bound" from closures #22966
Merged
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Remove the synthetic "region bound" from closures and instead update how
type-outlives works for closure types so that it ensures that all upvars
outlive the region in question. This gives the same guarantees but
without introducing artificial regions (and gives better error messages
to boot). This is refactoring towards #3696.
r? @pnkfelix