Detect case where two alternatives are the same after widening ExprTypes #18787
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In implicit or extension method search we might get two alternatives that are different but that point to the same singleton type after widening ExprTypes. In that case we can arbitrarily pick one of them instead of declaring an ambiguity. Fixes scala#18768
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TY for the fix 🙏 |
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@benhutchison You are very welcome! The good minimization helped a lot. |
dwijnand
approved these changes
Oct 30, 2023
| if (winsType2) 0 else 1 | ||
| if winsType1 && winsType2 | ||
| && alt1.widenExpr =:= alt2.widenExpr | ||
| && alt1.widenExpr.isStable |
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Check is isStable first, for performance?
odersky
commented
Oct 30, 2023
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I think with the swap in conditions you suggested there are no worries about performance anymore. Merging |
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In implicit or extension method search we might get two alternatives that are different but that point to the same singleton type after widening ExprTypes. In that case we can arbitrarily pick one of them instead of declaring an ambiguity.
Fixes #18768