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Fix #6083: Dealias before kind checking #6099

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Merged
merged 2 commits into from
Mar 20, 2019
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Fix #6083: Dealias before kind checking #6099

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fb13bc7
Fix #6083: Dealias before kind checking
odersky Mar 18, 2019
127ac60
Make `hasSimpleKind` follow aliases
odersky Mar 19, 2019
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5 changes: 4 additions & 1 deletion compiler/src/dotty/tools/dotc/core/TypeApplications.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -211,7 +211,10 @@ class TypeApplications(val self: Type) extends AnyVal {

/** Is self type of kind "*"? */
def hasSimpleKind(implicit ctx: Context): Boolean =
typeParams.isEmpty && !self.hasAnyKind
typeParams.isEmpty && !self.hasAnyKind || {
val alias = self.dealias
(alias ne self) && alias.hasSimpleKind
}

/** If self type is higher-kinded, its result type, otherwise NoType.
* Note: The hkResult of an any-kinded type is again AnyKind.
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3 changes: 3 additions & 0 deletions tests/pos/i6083.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
type K[T <: AnyKind] = T
val a: K[Int] = 1
val b: K[List][Int] = Nil