rust/src/test/ui/derives/deriving-with-repr-packed.rs

#![deny(unaligned_references)]

// check that derive on a packed struct with non-Copy fields
// correctly. This can't be made to work perfectly because
// we can't just use the field from the struct as it might
// not be aligned.

#[derive(Copy, Clone, PartialEq, Eq)]
//~^ ERROR `#[derive]` can't be used
//~| hard error
//~^^^ ERROR `#[derive]` can't be used
//~| hard error
#[repr(packed)]
pub struct Foo<T>(T, T, T);

#[derive(PartialEq, Eq)]
//~^ ERROR `#[derive]` can't be used
//~| hard error
#[repr(packed)]
pub struct Bar(u32, u32, u32);

#[derive(PartialEq)]
struct Y(usize);

#[derive(PartialEq)]
//~^ ERROR `#[derive]` can't be used
//~| hard error
#[repr(packed)]
struct X(Y);

fn main() {}