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Perform trait selection for builtin traits with a throw-away inference context, restoring the behavior prior to 83ef304. This prevents unwanted region constraints that lead to later errors.
This is the simplest way to fix the issue, but I'm not sure it's the correct one. I suspect
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impl selection is generating overly-strict region equality constraints, so another approach might be to throw more type/region variables at it until inference is happy.cc @nikomatsakis