adc7b8ea2d
To test whether the receiver type matches for the impl, we unify the given self type (in this case `HashSet<{unknown}>`) with the self type of the impl (`HashSet<?0>`), but if the given self type contains Unknowns, they won't be unified with the variables in those places. So we got a receiver type that was different from the expected one, and concluded the impl doesn't match. The fix is slightly hacky; if after the unification, our variables are still there, we make them fall back to Unknown. This does make some sense though, since we don't want to 'leak' the variables. Fixes #3547. |
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Cargo.toml |