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3a04ec8c56
Use a probe to avoid registering stray region obligations when re-checking drops in MIR typeck Fixes #137288. See the comment I left on the probe. I'm not totally sure why this depends on *both* an unconstrained type parameter in the impl and a type error for the self type, but I think the fix is at least theoretically well motivated. r? ```@matthewjasper```