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Fix crash in PatternMatcher for dependent type NamedTuple.From #24515

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Fix crash in PatternMatcher for dependent type NamedTuple.From #24515

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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/core/TypeUtils.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -156,7 +156,7 @@ class TypeUtils:
else
self

def isNamedTupleType(using Context): Boolean = self match
def isNamedTupleType(using Context): Boolean = self.normalized.dealias match
case defn.NamedTuple(_, _) => true
case _ => false

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12 changes: 12 additions & 0 deletions tests/pos/i24504.scala
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@@ -0,0 +1,12 @@
object Unpack {
trait Expr[T] {
type Fields = NamedTuple.From[T]
}
final case class Pair(a: Int, b: Int)
def unapply(e: Expr[Pair]): e.Fields = ???

val x: Expr[Pair] = ???
x match {
case Unpack(_, _) => ???
}
}
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