#![feature(intrinsics)]

// Directly call intrinsic to avoid debug assertions in libstd
extern "rust-intrinsic" {
    fn float_to_int_unchecked<Float: Copy, Int: Copy>(value: Float) -> Int;
}

fn main() {
    unsafe { float_to_int_unchecked::<f64, u64>(18446744073709551616.0f64); } //~ ERROR: cannot be represented in target type `u64`
}