tests/expectations/tests/no-derive-default.rs

#![allow(
    dead_code,
    non_snake_case,
    non_camel_case_types,
    non_upper_case_globals
)]

#[repr(C)]
#[derive(Copy, Clone, Debug)]
pub struct foo {
    bar: ::std::os::raw::c_int,
}

/// bar should compile. It will normally derive default, but our blocklist of foo
/// and replacement for another type that doesn't implement it would prevent it
/// from building if --no-derive-default didn't work.
#[repr(C)]
pub struct bar {
    pub foo: foo,
    pub baz: ::std::os::raw::c_int,
}
#[test]
fn bindgen_test_layout_bar() {
    assert_eq!(
        ::std::mem::size_of::<bar>(),
        8usize,
        concat!("Size of: ", stringify!(bar))
    );
    assert_eq!(
        ::std::mem::align_of::<bar>(),
        4usize,
        concat!("Alignment of ", stringify!(bar))
    );
    assert_eq!(
        {
            let struct_instance = unsafe { std::mem::zeroed::<bar>() };
            let struct_ptr = &struct_instance as *const bar;
            let field_ptr = std::ptr::addr_of!(struct_instance.foo);
            let struct_address = struct_ptr as usize;
            let field_address = field_ptr as usize;
            std::mem::forget(struct_instance);
            field_address.checked_sub(struct_address).unwrap()
        },
        0usize,
        concat!("Offset of field: ", stringify!(bar), "::", stringify!(foo))
    );
    assert_eq!(
        {
            let struct_instance = unsafe { std::mem::zeroed::<bar>() };
            let struct_ptr = &struct_instance as *const bar;
            let field_ptr = std::ptr::addr_of!(struct_instance.baz);
            let struct_address = struct_ptr as usize;
            let field_address = field_ptr as usize;
            std::mem::forget(struct_instance);
            field_address.checked_sub(struct_address).unwrap()
        },
        4usize,
        concat!("Offset of field: ", stringify!(bar), "::", stringify!(baz))
    );
}