message: Fix 'forget_copy' clippy warning
diff: @@ -109,13 +109,14 @@ macro_rules! implement_vertex {
  Cow::Borrowed(stringify!($field_name)),
  {
  // calculate the offset of the struct fields
  - let dummy: $struct_name = unsafe { ::std::mem::zeroed() };
  + let dummy: $struct_name = unsafe { ::std::mem::uninitialized() };
  let offset: usize = {
  let dummy_ref = &dummy;
  let field_ref = &dummy.$field_name;
  (field_ref as *const _ as usize) - (dummy_ref as *const _ as usize)
  };
  - ::std::mem::forget(dummy);
  + // NOTE: `glium::vertex::Vertex` requires `$struct_name` to have `Copy` trait
  + // `Copy` excludes `Drop`, so we don't have to `std::mem::forget(dummy)`
  offset
  },
  {
  