This is probably a well-known limitation, but I couldn't find any other issues for it with a quick search. Apologies if it's a duplicate.

// compiles
pub const fn foo() {
    assert!(1 == 1);
}

// does not compile
pub const fn bar() {
    assert_eq!(1, 1);
}

error[E0015]: cannot call non-const fn `core::panicking::assert_failed::<i32, i32>` in constant functions
 --> src/lib.rs:6:5
  |
6 |     assert_eq!(1, 1);
  |     ^^^^^^^^^^^^^^^^
  |

Playground link

Can core::panicking::assert_failed be made const?