error[E0080]: evaluation panicked: explicit panic --> $DIR/issue-88434-minimal-example.rs:5:22 | LL | const _CONST: &() = &f(&|_| {}); | ^^^^^^^^^^ evaluation of `_CONST` failed inside this call | note: inside `f::<{closure@$DIR/issue-88434-minimal-example.rs:5:25: 5:28}>` --> $DIR/issue-88434-minimal-example.rs:12:5 | LL | panic!() | ^^^^^^^^ the failure occurred here note: erroneous constant encountered --> $DIR/issue-88434-minimal-example.rs:5:21 | LL | const _CONST: &() = &f(&|_| {}); | ^^^^^^^^^^^ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0080`.