error[E0391]: cycle detected when simplifying constant for the type system `Foo::{constant#0}`
  --> $DIR/issue-36163.rs:4:9
   |
LL |     B = A,
   |         ^
   |
note: ...which requires const-evaluating + checking `Foo::{constant#0}`...
  --> $DIR/issue-36163.rs:4:9
   |
LL |     B = A,
   |         ^
note: ...which requires simplifying constant for the type system `A`...
  --> $DIR/issue-36163.rs:1:1
   |
LL | const A: isize = Foo::B as isize;
   | ^^^^^^^^^^^^^^
note: ...which requires const-evaluating + checking `A`...
  --> $DIR/issue-36163.rs:1:18
   |
LL | const A: isize = Foo::B as isize;
   |                  ^^^^^^^^^^^^^^^
   = note: ...which again requires simplifying constant for the type system `Foo::{constant#0}`, completing the cycle
note: cycle used when checking that `Foo` is well-formed
  --> $DIR/issue-36163.rs:3:1
   |
LL | enum Foo {
   | ^^^^^^^^
   = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information

error: aborting due to 1 previous error

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