error[E0391]: cycle detected when computing layout of `S` | = note: ...which requires computing layout of `core::option::Option<::It>`... = note: ...which requires computing layout of `core::option::Option`... = note: ...which again requires computing layout of `S`, completing the cycle note: cycle used when elaborating drops for `main` --> $DIR/issue-26548-recursion-via-normalize.rs:16:1 | LL | fn main() { | ^^^^^^^^^ error: aborting due to previous error For more information about this error, try `rustc --explain E0391`.