Fix #9479: Widen unions in inferred type lambdas #9488
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In the same way that when instantiating a type variable to `A | B` we first try to replace the union type by a non-union upper bound, we now also try to widen `[X] =>> A | B` to a type lambda whose body is not a union.
odersky
approved these changes
Aug 6, 2020
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In the same way that when instantiating a type variable to
A | Bwefirst try to replace the union type by a non-union upper bound, we now
also try to widen
[X] =>> A | Bto a type lambda whose body is not aunion.