Cache ambiguous trait results with caution around closures #21485
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…e by-product within. Fixes rust-lang#19499.
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r? @brson (rust_highfive has picked a reviewer for you, use r? to override) |
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Closing in favor of #21523 to spare bors |
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Do not cache ambiguous results unless there is at least some inference by-product within.
Fixes #19499.