error[E0080]: evaluation of constant value failed --> $DIR/issue-88434-minimal-example.rs:10:5 | LL | panic!() | ^^^^^^^^ the evaluated program panicked at 'explicit panic', $DIR/issue-88434-minimal-example.rs:10:5 | note: inside `f::<[closure@$DIR/issue-88434-minimal-example.rs:3:25: 3:28]>` --> $DIR/issue-88434-minimal-example.rs:10:5 | LL | panic!() | ^^^^^^^^ note: inside `_CONST` --> $DIR/issue-88434-minimal-example.rs:3:22 | LL | const _CONST: &() = &f(&|_| {}); | ^^^^^^^^^^ = note: this error originates in the macro `$crate::panic::panic_2015` which comes from the expansion of the macro `panic` (in Nightly builds, run with -Z macro-backtrace for more info) note: erroneous constant used --> $DIR/issue-88434-minimal-example.rs:3:21 | LL | const _CONST: &() = &f(&|_| {}); | ^^^^^^^^^^^ error: aborting due to previous error For more information about this error, try `rustc --explain E0080`.