error[E0080]: evaluation of constant value failed
  --> $DIR/issue-88434-removal-index-should-be-less.rs:11:5
   |
LL | const _CONST: &[u8] = &f(&[], |_| {});
   |                        -------------- inside `_CONST` at $DIR/issue-88434-removal-index-should-be-less.rs:3:24
...
LL |     panic!()
   |     ^^^^^^^^
   |     |
   |     the evaluated program panicked at 'explicit panic', $DIR/issue-88434-removal-index-should-be-less.rs:11:5
   |     inside `f::<[closure@$DIR/issue-88434-removal-index-should-be-less.rs:3:31: 3:37]>` at $SRC_DIR/std/src/panic.rs:LL:COL
   |
   = note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

error: any use of this value will cause an error
  --> $DIR/issue-88434-removal-index-should-be-less.rs:3:23
   |
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-88434-removal-index-should-be-less.rs:3:23
   |
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>