Expand maximum recognized discriminant to 64 bits
diff --git a/tests/ui/enum_overflows.rs b/tests/ui/enum_overflows.rs
index 3f351f0..29de1a0 100644
--- a/tests/ui/enum_overflows.rs
+++ b/tests/ui/enum_overflows.rs
@@ -1,14 +1,14 @@
 #[cxx::bridge]
 mod ffi {
     enum Good1 {
-        A = 0xffffffff,
+        A = 0xFFFF_FFFF_FFFF_FFFF,
     }
     enum Good2 {
-        B = 0xffffffff,
+        B = 0xFFFF_FFFF_FFFF_FFFF,
         C = 2020,
     }
     enum Bad {
-        D = 0xfffffffe,
+        D = 0xFFFF_FFFF_FFFF_FFFE,
         E,
         F,
     }