```rust
#[cfg_attr(not(feature = "panic_immediate_abort"), inline(never), cold)]
#[cfg_attr(feature = "panic_immediate_abort", inline)]
#[track_caller]
#[lang = "panic_fmt"] // needed for const-evaluated panics
#[rustc_do_not_const_check] // hooked by const-eval
#[rustc_const_stable_indirect] // must follow stable const rules since it is exposed to stable
pub const fn panic_fmt(fmt: fmt::Arguments<'_>) -> ! {
    if cfg!(feature = "panic_immediate_abort") {
        super::intrinsics::abort()
    }

    // NOTE This function never crosses the FFI boundary; it's a Rust-to-Rust call
    // that gets resolved to the `#[panic_handler]` function.
    unsafe extern "Rust" {
        #[lang = "panic_impl"]
        fn panic_impl(pi: &PanicInfo<'_>) -> !;
    }

    let pi = PanicInfo::new(
        &fmt,
        Location::caller(),
        /* can_unwind */ true,
        /* force_no_backtrace */ false,
    );

    // SAFETY: `panic_impl` is defined in safe Rust code and thus is safe to call.
    unsafe { panic_impl(&pi) }
}
```

everthing is fine until it reaches `Location::caller` 😅