Nullable::is_null

src/rstd/nullable.rs

@@ -91,6 +91,13 @@ impl<'a, Ctx: Context<'a>, A: Mentionable<'a, Ctx>> Nullable<'a, Ctx, A> {
             Nullable::NotNull(point) => Some(point),
         }
     }
+
+    pub fn is_null(&self) -> bool {
+        match self {
+            Nullable::Null(_) => true,
+            Nullable::NotNull(_) => false,
+        }
+    }
 }
 
 impl<F> NullableFactory<F> {