error: mismatched closing delimiter: `]` --> $DIR/issue-81827.rs:10:23 | LL | fn r()->i{0|{#[cfg(r(0{]0 | - ^^ mismatched closing delimiter | | | | | unclosed delimiter | closing delimiter possibly meant for this error: this file contains an unclosed delimiter --> $DIR/issue-81827.rs:10:27 | LL | fn r()->i{0|{#[cfg(r(0{]0 | - - - ^ | | | | | | | missing open `[` for this delimiter | | unclosed delimiter | unclosed delimiter error: aborting due to 2 previous errors