tests/expectations/tests/derive-default-and-blocklist.rs

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

pub struct BlocklistMe(u8);

/// Because this type contains a blocklisted type, it should not derive
/// Default. Instead, we should emit a `mem::zeroed` implementation.
#[repr(C)]
pub struct ShouldNotDeriveDefault {
    pub a: BlocklistMe,
}
#[test]
fn bindgen_test_layout_ShouldNotDeriveDefault() {
    assert_eq!(
        ::std::mem::size_of::<ShouldNotDeriveDefault>(),
        1usize,
        concat!("Size of: ", stringify!(ShouldNotDeriveDefault))
    );
    assert_eq!(
        ::std::mem::align_of::<ShouldNotDeriveDefault>(),
        1usize,
        concat!("Alignment of ", stringify!(ShouldNotDeriveDefault))
    );
    assert_eq!(
        {
            let struct_instance =
                unsafe { std::mem::zeroed::<ShouldNotDeriveDefault>() };
            let struct_ptr = &struct_instance as *const ShouldNotDeriveDefault;
            let field_ptr = std::ptr::addr_of!(struct_instance.a);
            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!(ShouldNotDeriveDefault),
            "::",
            stringify!(a)
        )
    );
}
impl Default for ShouldNotDeriveDefault {
    fn default() -> Self {
        let mut s = ::std::mem::MaybeUninit::<Self>::uninit();
        unsafe {
            ::std::ptr::write_bytes(s.as_mut_ptr(), 0, 1);
            s.assume_init()
        }
    }
}