gcc/testsuite/rust/compile/torture/intrinsics-2.rs

// { dg-additional-options -fdump-tree-original }
#![feature(no_core)]
#![no_core]


#![feature(intrinsics)]

#![feature(lang_items)]
#[lang = "sized"]
pub trait Sized {}

extern "rust-intrinsic" {
    pub fn size_of<T>() -> usize;
}

fn main() -> i32 {
    unsafe fn foo() -> usize {
        let f: f32;

        let s_f32 = size_of::<f32>();
        let s_f64 = size_of::<f64>();
        let s_f32_again = size_of::<f32>();

        s_f32 + s_f64 + s_f32_again
    }

    // useless code, just used for function compilation caching
    unsafe { foo() as i32 }
}