error[E0381]: borrow of possibly-uninitialized variable: `x` --> $DIR/issue-78655.rs:3:5 | LL | &x | ^^ use of possibly-uninitialized `x` error: could not evaluate constant pattern --> $DIR/issue-78655.rs:7:9 | LL | let FOO = FOO; | ^^^ error: could not evaluate constant pattern --> $DIR/issue-78655.rs:7:9 | LL | let FOO = FOO; | ^^^ error: aborting due to 3 previous errors For more information about this error, try `rustc --explain E0381`.