error[E0381]: used binding `x` isn't initialized --> $DIR/issue-78655.rs:3:5 | LL | let x; | - binding declared here but left uninitialized LL | &x | ^^ `x` used here but it isn't initialized 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`.