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-rw-r--r--Dafny/DafnyAst.cs1
1 files changed, 1 insertions, 0 deletions
diff --git a/Dafny/DafnyAst.cs b/Dafny/DafnyAst.cs
index 58dcc262..b410b37d 100644
--- a/Dafny/DafnyAst.cs
+++ b/Dafny/DafnyAst.cs
@@ -2047,6 +2047,7 @@ namespace Microsoft.Dafny {
public class LiteralExpr : Expression {
public readonly object Value;
+ [Pure]
public static bool IsTrue(Expression e) {
Contract.Requires(e != null);
if (e is LiteralExpr) {