Derive Macro TypeStructCodec 

#[derive(TypeStructCodec)]
{
    // Attributes available to this derive:
    #[type_struct_codec]
}

Derives [mcproto_types::TypeCodec] for a protocol structure.

Fields are encoded and decoded in declaration order. A codec kind must be supplied so errors from individual fields retain the enclosing structure:

#[derive(TypeStructCodec)]
#[type_struct_codec(kind = Slot)]
struct Item {
    id: VarInt,
    count: VarInt,
}