added multiple trait inheritance.

- a class can now extend more than one traits

1 files changed, 2 insertions, 2 deletions

diff --git a/Source/Dafny/Printer.cs b/Source/Dafny/Printer.cs
index 36eeb554..3cc4e57d 100644
--- a/Source/Dafny/Printer.cs
+++ b/Source/Dafny/Printer.cs
@@ -298,8 +298,8 @@ namespace Microsoft.Dafny {
       Contract.Requires(c != null);

       Indent(indent);

       PrintClassMethodHelper((c is TraitDecl) ? "trait" : "class", c.Attributes, c.Name, c.TypeArgs);

-      if (c.TraitTyp != null) {

-          wr.Write(" extends {0}", ((UserDefinedType)(c.TraitTyp)).tok);

+      if (c.TraitsStr!=string.Empty) {

+          wr.Write(" extends {0}", c.TraitsStr);

       }

       if (c.Members.Count == 0) {

         wr.WriteLine(" { }");