From 8c256ff44a7f995f4d6bed36735ef11cc38fe04d Mon Sep 17 00:00:00 2001
From: Emil Ejbyfeldt <emil.ejbyfeldt@choreograph.com>
Date: Fri, 13 Jun 2025 16:05:05 +0200
Subject: [PATCH] Fix issue 23158

The fix is made based on us doing stripNamedTuple in other parts close
by. Seems like made should in a single place, but I lack the bigger
understanding to figure our where that would be.
---
 .../src/dotty/tools/dotc/transform/patmat/Space.scala |  2 +-
 tests/pos/i23158.scala                                | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 tests/pos/i23158.scala

diff --git a/compiler/src/dotty/tools/dotc/transform/patmat/Space.scala b/compiler/src/dotty/tools/dotc/transform/patmat/Space.scala
index ab5885e6278c..d2b799c33f25 100644
--- a/compiler/src/dotty/tools/dotc/transform/patmat/Space.scala
+++ b/compiler/src/dotty/tools/dotc/transform/patmat/Space.scala
@@ -570,7 +570,7 @@ object SpaceEngine {
     // Case unapplySeq:
     // 1. return the type `List[T]` where `T` is the element type of the unapplySeq return type `Seq[T]`
 
-    val resTp = wildApprox(ctx.typeAssigner.safeSubstMethodParams(mt, scrutineeTp :: Nil).finalResultType)
+    val resTp = wildApprox(ctx.typeAssigner.safeSubstMethodParams(mt, scrutineeTp :: Nil).finalResultType).stripNamedTuple
 
     val sig =
       if (resTp.isRef(defn.BooleanClass))
diff --git a/tests/pos/i23158.scala b/tests/pos/i23158.scala
new file mode 100644
index 000000000000..228721329701
--- /dev/null
+++ b/tests/pos/i23158.scala
@@ -0,0 +1,11 @@
+//> using options -Werror
+
+object Unpack {
+  final case class Pair(a: Int, b: Int)
+  def unapply(e: Pair): NamedTuple.NamedTuple[("a", "b"), (Int, Int)] = ???
+
+  val x: Pair = ???
+  x match {
+    case Unpack(_, _) => ???
+  }
+}