Use the local cache for trait selection in all non-empty environments #22028
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are any where-clauses at all. This seems to be the simplest possible rule and will (hopefully!) put an end to these annoying "cache leak" bugs. Fixes rust-lang#22019.
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Simplify cache selection by just using the local cache whenever there
are any where-clauses at all. This seems to be the simplest possible
rule and will (hopefully!) put an end to these annoying "cache leak"
bugs. Fixes #22019.
r? @aturon