Made invariant of class 'Ensures' robust by changing the design (replaced public field by private field + getter/setter).

1 files changed, 16 insertions, 3 deletions

diff --git a/Source/Core/Absy.cs b/Source/Core/Absy.cs
index 37c86d59..e2e37345 100644
--- a/Source/Core/Absy.cs
+++ b/Source/Core/Absy.cs
@@ -2780,10 +2780,23 @@ namespace Microsoft.Boogie {
 

   public class Ensures : Absy, IPotentialErrorNode {

     public readonly bool Free;

-    public Expr/*!*/ Condition;

+

+    private Expr/*!*/ _condition;

+ 	  

+ 	  public Expr/*!*/ Condition {

+ 	    get {

+ 	      Contract.Ensures(Contract.Result<Expr>() != null);

+ 	      return this._condition;

+ 	    }

+ 	    set {

+ 	      Contract.Requires(value != null);

+ 	      this._condition = value;

+ 	    }

+ 	  }

+

     [ContractInvariantMethod]

     void ObjectInvariant() {

-      Contract.Invariant(Condition != null);

+      Contract.Invariant(this._condition != null); 

       Contract.Invariant(errorData == null || errorData is string);

     }

 

@@ -2823,7 +2836,7 @@ namespace Microsoft.Boogie {
       Contract.Requires(condition != null);

       Contract.Requires(token != null);

       this.Free = free;

-      this.Condition = condition;

+      this._condition = condition; 

       this.Comment = comment;

       this.Attributes = kv;

     }