error[E0391]: cycle detected when const checking if rvalue is promotable to static `A`
  --> $DIR/issue-23302-3.rs:1:1
   |
LL | const A: i32 = B; //~ ERROR cycle detected
   | ^^^^^^^^^^^^^^^^^
   |
note: ...which requires checking which parts of `A` are promotable to static...
  --> $DIR/issue-23302-3.rs:1:16
   |
LL | const A: i32 = B; //~ ERROR cycle detected
   |                ^
note: ...which requires const checking if rvalue is promotable to static `B`...
  --> $DIR/issue-23302-3.rs:3:1
   |
LL | const B: i32 = A;
   | ^^^^^^^^^^^^^^^^^
note: ...which requires checking which parts of `B` are promotable to static...
  --> $DIR/issue-23302-3.rs:3:16
   |
LL | const B: i32 = A;
   |                ^
   = note: ...which again requires const checking if rvalue is promotable to static `A`, completing the cycle

error: aborting due to previous error

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