error[E0080]: evaluation of constant value failed
  --> $DIR/issue-81899.rs:12:5
   |
LL | const _CONST: &[u8] = &f(&[], |_| {});
   |                        -------------- inside `_CONST` at $DIR/issue-81899.rs:4:24
...
LL |     panic!()
   |     ^^^^^^^^
   |     |
   |     the evaluated program panicked at 'explicit panic', $DIR/issue-81899.rs:12:5
   |     inside `f::<[closure@$DIR/issue-81899.rs:4:31: 4:34]>` at $SRC_DIR/std/src/panic.rs:LL:COL
   |
   = note: this error originates in the macro `$crate::panic::panic_2015` which comes from the expansion of the macro `panic` (in Nightly builds, run with -Z macro-backtrace for more info)

error: any use of this value will cause an error
  --> $DIR/issue-81899.rs:4:23
   |
LL | const _CONST: &[u8] = &f(&[], |_| {});
   | -------------------   ^^^^^^^^^^^^^^^ referenced constant has errors
   |
   = note: `#[deny(const_err)]` on by default
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0080`.
Future incompatibility report: Future breakage diagnostic:
error: any use of this value will cause an error
  --> $DIR/issue-81899.rs:4:23
   |
LL | const _CONST: &[u8] = &f(&[], |_| {});
   | -------------------   ^^^^^^^^^^^^^^^ referenced constant has errors
   |
   = note: `#[deny(const_err)]` on by default
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>