error[E0391]: cycle detected when simplifying constant for the type system `Alpha::V3::{constant#0}`
  --> $DIR/self-in-enum-definition.rs:5:10
   |
LL |     V3 = Self::V1 {} as u8 + 2,
   |          ^^^^^^^^
   |
note: ...which requires simplifying constant for the type system `Alpha::V3::{constant#0}`...
  --> $DIR/self-in-enum-definition.rs:5:10
   |
LL |     V3 = Self::V1 {} as u8 + 2,
   |          ^^^^^^^^
note: ...which requires const-evaluating + checking `Alpha::V3::{constant#0}`...
  --> $DIR/self-in-enum-definition.rs:5:10
   |
LL |     V3 = Self::V1 {} as u8 + 2,
   |          ^^^^^^^^
   = note: ...which requires computing layout of `Alpha`...
   = note: ...which again requires simplifying constant for the type system `Alpha::V3::{constant#0}`, completing the cycle
note: cycle used when collecting item types in top-level module
  --> $DIR/self-in-enum-definition.rs:1:1
   |
LL | / #[repr(u8)]
LL | | enum Alpha {
LL | |     V1 = 41,
LL | |     V2 = Self::V1 as u8 + 1,    // OK; See #50072.
...  |
LL | |
LL | | fn main() {}
   | |____________^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0391`.