error[E0391]: cycle detected when processing `Foo::B::{{constant}}`
  --> $DIR/issue-36163.rs:14:9
   |
LL |     B = A, //~ ERROR E0391
   |         ^
   |
note: ...which requires processing `A`...
  --> $DIR/issue-36163.rs:11:18
   |
LL | const A: isize = Foo::B as isize;
   |                  ^^^^^^^^^^^^^^^
   = note: ...which again requires processing `Foo::B::{{constant}}`, completing the cycle
note: cycle used when const-evaluating `Foo::B::{{constant}}`
  --> $DIR/issue-36163.rs:14:9
   |
LL |     B = A, //~ ERROR E0391
   |         ^

error: aborting due to previous error

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