IEnumerable<T> in .NET 3.5 is not covariant

2013-02-27 13:24:19 -06:00 · 2013-02-27 13:24:19 -06:00 · f063557b7b
parent 1020033096
commit f063557b7b
1 changed files with 4 additions and 0 deletions
--- a/runtime/CSharp/Antlr4.Runtime/Atn/SemanticContext.cs
+++ b/runtime/CSharp/Antlr4.Runtime/Atn/SemanticContext.cs
@ -392,7 +392,11 @@ namespace Antlr4.Runtime.Atn
                Collections.EmptyList<PrecedencePredicate>();

            List<PrecedencePredicate> result = collection.OfType<PrecedencePredicate>().ToList();
+#if NET_4_0
            collection.ExceptWith(result);
+#else
+            collection.ExceptWith(result.Cast<SemanticContext>());
+#endif
            return result;
        }
    }