Fix issue 121. Don't split QuantifierExpr that are empty.

1 files changed, 3 insertions, 2 deletions

diff --git a/Source/Dafny/Triggers/QuantifierSplitter.cs b/Source/Dafny/Triggers/QuantifierSplitter.cs
index d0b2b430..b039a402 100644
--- a/Source/Dafny/Triggers/QuantifierSplitter.cs
+++ b/Source/Dafny/Triggers/QuantifierSplitter.cs
@@ -100,8 +100,9 @@ namespace Microsoft.Dafny.Triggers {
     }

     

     private static bool AllowsSplitting(QuantifierExpr quantifier) {

-      bool splitAttr = true;

-      return !Attributes.ContainsBool(quantifier.Attributes, "split", ref splitAttr) || splitAttr;

+      // allow split if attributes doesn't contains "split" or it is "split: true" and it is not an empty QuantifierExpr (boundvar.count>0)

+      bool splitAttr = true; 

+      return (!Attributes.ContainsBool(quantifier.Attributes, "split", ref splitAttr) || splitAttr) && (quantifier.BoundVars.Count > 0);

     }

 

     protected override void VisitOneExpr(Expression expr) {