3 files changed, 16 insertions, 0 deletions
diff --git a/src/compiler/scala/tools/nsc/transform/patmat/PatternMatching.scala b/src/compiler/scala/tools/nsc/transform/patmat/PatternMatching.scala
index d35aad964d..b2f2516b5b 100644
--- a/src/compiler/scala/tools/nsc/transform/patmat/PatternMatching.scala
+++ b/src/compiler/scala/tools/nsc/transform/patmat/PatternMatching.scala
@@ -239,6 +239,11 @@ trait Interface extends ast.TreeDSL {
               case Ident(_) => subst(from, to)
               case _        => super.transform(tree)
             }
+            tree1 match {
+              case _: DefTree =>
+                tree1.symbol.modifyInfo(_.substituteTypes(from, toTypes))
+              case _ =>
+            }
             tree1.modifyType(_.substituteTypes(from, toTypes))
           }
         }
diff --git a/test/files/pos/t9123.flags b/test/files/pos/t9123.flags
new file mode 100644
index 0000000000..c16e2f71dc
--- /dev/null
+++ b/test/files/pos/t9123.flags
@@ -0,0 +1 @@
+-optimize -Ydelambdafy:method
diff --git a/test/files/pos/t9123.scala b/test/files/pos/t9123.scala
new file mode 100644
index 0000000000..22d55b4351
--- /dev/null
+++ b/test/files/pos/t9123.scala
@@ -0,0 +1,10 @@
+trait Setting {
+  type T
+  def value: T
+}
+
+object Test {
+  def test(x: Some[Setting]) = x match {
+    case Some(dep) => Some(dep.value) map (_ => true)
+  }
+}