Dafny: disallow changes of datatypes in refinements

1 files changed, 1 insertions, 10 deletions

diff --git a/Dafny/RefinementTransformer.cs b/Dafny/RefinementTransformer.cs
index a25d1eb8..adf99859 100644
--- a/Dafny/RefinementTransformer.cs
+++ b/Dafny/RefinementTransformer.cs
@@ -104,11 +104,7 @@ namespace Microsoft.Dafny {
           } else if (nw is ArbitraryTypeDecl) {

             reporter.Error(nw, "an arbitrary type declaration ({0}) in a refining module cannot replace a more specific type declaration in the refinement base", nw.Name);

           } else if (nw is DatatypeDecl) {

-            if (d is ClassDecl) {

-              reporter.Error(nw, "a datatype declaration ({0}) in a refining module cannot replace a class declaration in the refinement base", nw.Name);

-            } else {

-              m.TopLevelDecls[index] = MergeDatatype((DatatypeDecl)nw, (DatatypeDecl)d);

-            }

+            reporter.Error(nw, "a datatype declaration ({0}) in a refinement module can only replace an arbitrary-type declaration", nw.Name);

           } else {

             Contract.Assert(nw is ClassDecl);

             if (d is DatatypeDecl) {

@@ -502,11 +498,6 @@ namespace Microsoft.Dafny {
 

     // -------------------------------------------------- Merging ---------------------------------------------------------------

 

-    DatatypeDecl MergeDatatype(DatatypeDecl nw, DatatypeDecl prev) {

-      // TODO

-      return nw;

-    }

-

     ClassDecl MergeClass(ClassDecl nw, ClassDecl prev) {

       // TODO

       return nw;