error[E0391]: cycle detected when const-evaluating + checking `Tr::A` --> $DIR/defaults-cyclic-fail.rs:5:5 | LL | const A: u8 = Self::B; | ^^^^^^^^^^^^^^^^^^^^^^ | note: ...which requires const-evaluating + checking `Tr::B`... --> $DIR/defaults-cyclic-fail.rs:8:5 | LL | const B: u8 = Self::A; | ^^^^^^^^^^^^^^^^^^^^^^ = note: ...which again requires const-evaluating + checking `Tr::A`, completing the cycle note: cycle used when const-evaluating + checking `main::promoted[1]` --> $DIR/defaults-cyclic-fail.rs:16:16 | LL | assert_eq!(<() as Tr>::A, 0); | ^^^^^^^^^^^^^ error: aborting due to previous error For more information about this error, try `rustc --explain E0391`.