diff options
Diffstat (limited to 'Source/VCExpr/VCExprASTVisitors.cs')
-rw-r--r-- | Source/VCExpr/VCExprASTVisitors.cs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Source/VCExpr/VCExprASTVisitors.cs b/Source/VCExpr/VCExprASTVisitors.cs index c43ee478..344d795b 100644 --- a/Source/VCExpr/VCExprASTVisitors.cs +++ b/Source/VCExpr/VCExprASTVisitors.cs @@ -623,7 +623,7 @@ namespace Microsoft.Boogie.VCExprAST { public readonly List<TypeVariable/*!*/>/*!*/ FreeTypeVars = new List<TypeVariable/*!*/>();
[ContractInvariantMethod]
void ObjectInvariant() {
- Contract.Invariant(cce.NonNullElements(FreeTermVars));
+ Contract.Invariant(FreeTermVars != null && Contract.ForAll(FreeTermVars, entry => entry.Key != null));
Contract.Invariant(cce.NonNullElements(FreeTypeVars));
}
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