Refer to #50072 re. hack.

src/test/ui/type-alias-enum-variants/self-in-enum-definition.rs

@@ -1,7 +1,7 @@
 #[repr(u8)]
 enum Alpha {
     V1 = 41,
-    V2 = Self::V1 as u8 + 1, // OK -- but why?
+    V2 = Self::V1 as u8 + 1, // OK; See #50072.
     V3 = Self::V1 {} as u8 + 2, //~ ERROR cycle detected when const-evaluating
 }
 

src/test/ui/type-alias-enum-variants/self-in-enum-definition.stderr

@@ -17,7 +17,7 @@ note: cycle used when collecting item types in top-level module
 LL | / #[repr(u8)]
 LL | | enum Alpha {
 LL | |     V1 = 41,
-LL | |     V2 = Self::V1 as u8 + 1, // OK -- but why?
+LL | |     V2 = Self::V1 as u8 + 1, // OK; See #50072.
 ...  |
 LL | |
 LL | | fn main() {}