#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::alloc::{Layout, LayoutError};
pub fn repr_c(fields: &[Layout]) -> Result<(Layout, Vec<usize>), LayoutError> {
    let mut offsets = Vec::new();
    let mut layout = Layout::from_size_align(0, 1)?;
    for &field in fields {
        let (new_layout, offset) = layout.extend(field)?;
        layout = new_layout;
        offsets.push(offset);
    }
    Ok((layout.pad_to_align(), offsets))
}
#[repr(C)]
struct S {
    a: u64,
    b: u32,
    c: u16,
    d: u32,
}
fn main() {
    let s = Layout::new::<S>();
    let u16 = Layout::new::<u16>();
    let u32 = Layout::new::<u32>();
    let u64 = Layout::new::<u64>();
    assert_eq!(repr_c(& [u64, u32, u16, u32]), Ok((s, vec![0, 8, 12, 16])));
}