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Fix #3343: Make baseType work properly with type lambdas #3345

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Merged
merged 1 commit into from
Oct 19, 2017
Merged

Fix #3343: Make baseType work properly with type lambdas #3345

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10 changes: 4 additions & 6 deletions compiler/src/dotty/tools/dotc/core/SymDenotations.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1646,13 +1646,11 @@ object SymDenotations {
case tp @ AppliedType(tycon, args) =>
val subsym = tycon.typeSymbol
if (subsym eq symbol) tp
else subsym.denot match {
case clsd: ClassDenotation =>
val tparams = clsd.typeParams
if (tparams.hasSameLengthAs(args)) baseTypeOf(tycon).subst(tparams, args)
else NoType
case _ =>
else tycon.typeParams match {
case LambdaParam(_, _) :: _ =>
baseTypeOf(tp.superType)
case tparams: List[Symbol @unchecked] =>
baseTypeOf(tycon).subst(tparams, args)
}
case tp: TypeProxy =>
baseTypeOf(tp.superType)
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5 changes: 5 additions & 0 deletions tests/pos/i3343.scala
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@@ -0,0 +1,5 @@
object Test {
def foo[C[_]](implicit t: C[Char] => Traversable[Char]): C[Char] = ???

val a: List[Char] = foo
}