use new method

svn path=/trunk/mcs/; revision=103286

diff --git a/mcs/class/System.Core/System.Linq.Expressions/Expression.cs b/mcs/class/System.Core/System.Linq.Expressions/Expression.cs
index 0715a7a48fea6fc68b018ec74e2400baa0270d4e..5a6180c93af3ace429e96203ff2fb02ab777e9ed 100644 (file)
--- a/mcs/class/System.Core/System.Linq.Expressions/Expression.cs
+++ b/mcs/class/System.Core/System.Linq.Expressions/Expression.cs
@@ -2080,8 +2080,7 @@ namespace System.Linq.Expressions {
 
                internal static bool IsNullable (Type type)
                {
-                       return type.IsGenericType && type.GetGenericTypeDefinition () == typeof (Nullable<>);
-               }
+                       return type.IsGenericInstanceOf (typeof (Nullable<>));          }
 
                static bool IsSignedNumber (Type t)
                {