Regression test for Scala Bug 4043 #7608
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Bug 4043 involved computing a least upper bound between types used as arguments for a higher-kinded type parameters. This is still unsolved in Scala 2.12.8, but already works in Scala 2.13.x branch.
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Closes scala/bug#4043, which is already solved in Scala 2.13.x, by adding a regression.
Bug 4043, originally reported by @retronym, involved computing a least upper bound between types used as arguments for a higher-kinded type parameters. This is still unsolved in Scala 2.12.8, but already works in Scala 2.13.x branch.