error[E0391]: cycle detected when processing `FOO` --> $DIR/issue-17252.rs:1:20 | LL | const FOO: usize = FOO; //~ ERROR E0391 | ^^^ | = note: ...which again requires processing `FOO`, completing the cycle note: cycle used when processing `main::{{constant}}` --> $DIR/issue-17252.rs:4:18 | LL | let _x: [u8; FOO]; // caused stack overflow prior to fix | ^^^ error: aborting due to previous error For more information about this error, try `rustc --explain E0391`.