Avoid impls_fnonce to return true when the trait solving is ambiguous #6376
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I'm not sure this is an ideal solution, because bors r+ |
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This PR should fix #6375
This adds a variation of
method_resolution::implements_traitcalledmethod_resolution::implements_trait_unique, that only returns true when the trait solving is unique, and also changeimpls_fnonceto use the later instead.I also added a test just to be sure.