The number of source code bytes can't exceed a `u32`'s range, so a token position also can't. This reduces the size of `Parser` and `LazyAttrTokenStreamImpl` by eight bytes each.
The number of source code bytes can't exceed a `u32`'s range, so a token position also can't. This reduces the size of `Parser` and `LazyAttrTokenStreamImpl` by eight bytes each.