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:1:18 | 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, | ^ = 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 previous error For more information about this error, try `rustc --explain E0391`.