Fix SI-4928

better error message when a parameter is first defined positionally, then with a named argument.

1 files changed, 6 insertions, 2 deletions

diff --git a/src/compiler/scala/tools/nsc/typechecker/ContextErrors.scala b/src/compiler/scala/tools/nsc/typechecker/ContextErrors.scala
index 0c1638b76f..df0258832c 100644
--- a/src/compiler/scala/tools/nsc/typechecker/ContextErrors.scala
+++ b/src/compiler/scala/tools/nsc/typechecker/ContextErrors.scala
@@ -1040,8 +1040,12 @@ trait ContextErrors {
       setError(arg)
     }
 
-    def DoubleParamNamesDefaultError(arg: Tree, name: Name)(implicit context: Context) = {
-      issueNormalTypeError(arg, "parameter specified twice: "+ name)
+    def DoubleParamNamesDefaultError(arg: Tree, name: Name, pos: Int, otherName: Option[Name])(implicit context: Context) = {
+      val annex = otherName match {
+        case Some(oName) => "\nNote that that '"+ oName +"' is not a parameter name of the invoked method."
+        case None => ""
+      }
+      issueNormalTypeError(arg, "parameter '"+ name +"' is already specified at parameter position "+ pos + annex)
       setError(arg)
     }