error[E0391]: cycle detected when const-evaluating + checking `Foo::B::{constant#0}`
  --> $DIR/issue-36163.rs:4:9
   |
LL |     B = A,
   |         ^
   |
note: ...which requires const-evaluating + checking `A`...
  --> $DIR/issue-36163.rs:1:1
   |
LL | const A: isize = Foo::B as isize;
   | ^^^^^^^^^^^^^^
   = note: ...which again requires const-evaluating + checking `Foo::B::{constant#0}`, completing the cycle
note: cycle used when simplifying constant for the type system `Foo::B::{constant#0}`
  --> $DIR/issue-36163.rs:4:9
   |
LL |     B = A,
   |         ^

error: aborting due to previous error

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