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Diffstat (limited to 'tests/pos/t7517.scala')
-rw-r--r-- | tests/pos/t7517.scala | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/tests/pos/t7517.scala b/tests/pos/t7517.scala new file mode 100644 index 000000000..d0462c48d --- /dev/null +++ b/tests/pos/t7517.scala @@ -0,0 +1,23 @@ +// Invalid because nested hk type parameters are no longer allowed +trait Box[ K[A[x]] ] + +object Box { + // type constructor composition + sealed trait ∙[A[_], B[_]] { type l[T] = A[B[T]] } + + // composes type constructors inside K + type SplitBox[K[A[x]], B[x]] = Box[ ({ type l[A[x]] = K[ (A ∙ B)#l] })#l ] + + def split[ K[A[x]], B[x] ](base: Box[K]): SplitBox[K,B] = ??? + + class Composed[B[_], L[A[x]] ] { + val box: Box[L] = ??? + + type Split[ A[x] ] = L[ (A ∙ B)#l ] + val a: Box[Split] = Box.split(box) + + //Either of these work: + val a1: Box[Split] = Box.split[L,B](box) + val a2: Box[ ({ type l[A[x]] = L[ (A ∙ B)#l ] })#l ] = Box.split(box) + } +} |