rust/tests/ui/consts/required-consts/collect-in-dead-fn.rs

//@revisions: noopt opt
//@ build-fail
//@[noopt] compile-flags: -Copt-level=0
//@[opt] compile-flags: -O
//! This fails without optimizations, so it should also fail with optimizations.

struct Fail<T>(T);
impl<T> Fail<T> {
    const C: () = panic!(); //~ERROR evaluation of `Fail::<i32>::C` failed
}

// This function is not actually called, but it is mentioned in dead code in a function that is
// called. Make sure we still find this error.
// This relies on mono-item collection checking `required_consts` in functions that syntactically
// are called in collected functions (even inside dead code).
#[inline(never)]
fn not_called<T>() {
    if false {
        let _ = Fail::<T>::C;
    }
}

#[inline(never)]
fn called<T>() {
    if false {
        not_called::<T>();
    }
}

pub fn main() {
    called::<i32>();
}