1 files changed, 9 insertions, 2 deletions
diff --git a/src/compiler/scala/tools/nsc/typechecker/Typers.scala b/src/compiler/scala/tools/nsc/typechecker/Typers.scala
index 1f5ad3534e..3ac0b398ee 100644
--- a/src/compiler/scala/tools/nsc/typechecker/Typers.scala
+++ b/src/compiler/scala/tools/nsc/typechecker/Typers.scala
@@ -2598,8 +2598,15 @@ trait Typers extends Adaptations with Tags with TypersTracking with PatternTyper
             default -> gen.scalaFunctionConstr(List(A1Tpt), B1Tpt)
           )
         }
-        val rhs = methodBodyTyper.virtualizedMatch(match_, mode, B1.tpe)
-        val defdef = DefDef(methodSym, Modifiers(methodSym.flags), originals, rhs)
+        def newParam(param: Symbol): ValDef = {
+          val vd              = ValDef(param, EmptyTree)
+          val tt @ TypeTree() = vd.tpt
+          tt setOriginal (originals(param) setPos param.pos.focus)
+          vd
+        }
+
+        val rhs    = methodBodyTyper.virtualizedMatch(match_, mode, B1.tpe)
+        val defdef = newDefDef(methodSym, rhs)(vparamss = mapParamss(methodSym)(newParam))
 
         (defdef, matchResTp)
       }