Fix #9088: Fix problematic code in productMirror #9089
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odersky
commented
May 31, 2020
| case mirroredType: HKTypeLambda => | ||
| val elems = | ||
| mirroredType.derivedLambdaType( | ||
| resType = TypeOps.nestedPairs(accessors.map(mirroredType.memberInfo(_).widenExpr)) |
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mirroredType.memberInfo(_) makes no sense here. mirroredType is a type lambda, and as such not a legal prefix on which we can take a memberInfo. So I changed to just _.info which avoids the crash. However, I have no idea whether that's correct.
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@milessabin This looks still fishy to me. But I have no idea how to formulate a correct derivation in the higher-kinded case. |
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This is merged as part of #9090. @milessabin it would still be good if you could take a look at the changes to the higher-kinded product mirror materialization. |
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I'm not seeing anything obviously problematic about the change. |
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