Change the induction heuristic for lemmas to also look in precondition for clues about which parameters to include.

As a result, improved many test cases (see, e.g., dafny4/NipkowKlein-chapter7.dfy!) and beautified some others.

1 files changed, 2 insertions, 1 deletions

diff --git a/Source/Dafny/Printer.cs b/Source/Dafny/Printer.cs
index 1f63d769..6a6a76ba 100644
--- a/Source/Dafny/Printer.cs
+++ b/Source/Dafny/Printer.cs
@@ -438,6 +438,7 @@ namespace Microsoft.Dafny {
     public void PrintAttributes(Attributes a) {

       if (a != null) {

         PrintAttributes(a.Prev);

+        wr.Write(" ");

         PrintOneAttribute(a);

       }

     }

@@ -445,7 +446,7 @@ namespace Microsoft.Dafny {
       Contract.Requires(a != null);

       var name = nameSubstitution ?? a.Name;

       var usAttribute = name.StartsWith("_");

-      wr.Write(" {1}{{:{0}", name, usAttribute ? "/*" : "");

+      wr.Write("{1}{{:{0}", name, usAttribute ? "/*" : "");

       if (a.Args != null) {

         PrintAttributeArgs(a.Args, false);

       }