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Avoid crash in uninhab check in Space #22601

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Merged
merged 1 commit into from
Feb 17, 2025
Merged

Avoid crash in uninhab check in Space #22601

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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/transform/patmat/Space.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -674,7 +674,7 @@ object SpaceEngine {
val superType = child.typeRef.superType
if typeArgs.exists(_.isBottomType) && superType.isInstanceOf[ClassInfo] then
val parentClass = superType.asInstanceOf[ClassInfo].declaredParents.find(_.classSymbol == parent).get
val paramTypeMap = Map.from(parentClass.argTypes.map(_.typeSymbol).zip(typeArgs))
val paramTypeMap = Map.from(parentClass.argInfos.map(_.typeSymbol).zip(typeArgs))
val substArgs = child.typeRef.typeParamSymbols.map(param => paramTypeMap.getOrElse(param, WildcardType))
substArgs
else Nil
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9 changes: 9 additions & 0 deletions tests/pos/i22518.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
sealed trait Foo[T]
class Bar extends Foo[?]

def mkFoo[T]: Foo[T] =
???

def test: Unit =
mkFoo match
case _ => ()
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