tests/codegen-units/item-collection/unreferenced-const-fn.rs

#![deny(dead_code)]
#![crate_type = "rlib"]

//~ MONO_ITEM fn foo @@ unreferenced_const_fn-cgu.0[External]
#[inline(never)]
pub const fn foo(x: u32) -> u32 {
    x + 0xf00
}