#![feature(intrinsics)] // Directly call intrinsic to avoid debug assertions in libstd extern "rust-intrinsic" { fn float_to_int_unchecked(value: Float) -> Int; } fn main() { unsafe { float_to_int_unchecked::(-240282366920938463463374607431768211455.0f64); //~ ERROR: cannot be represented in target type `i128` } }