Expand maximum recognized discriminant to 64 bits
diff --git a/tests/ui/enum_overflows.stderr b/tests/ui/enum_overflows.stderr
index db92f7f..ed58b61 100644
--- a/tests/ui/enum_overflows.stderr
+++ b/tests/ui/enum_overflows.stderr
@@ -1,4 +1,4 @@
-error: discriminant overflow on value after 4294967295
+error: discriminant overflow on value after 18446744073709551615
   --> $DIR/enum_overflows.rs:13:9
    |
 13 |         F,