fn concat_bytes_expand(
_db: &dyn SourceDatabase,
_arg_id: MacroCallId,
tt: &TopSubtree,
call_site: Span,
) -> ExpandResult<TopSubtree>fn concat_bytes_expand(
_db: &dyn SourceDatabase,
_arg_id: MacroCallId,
tt: &TopSubtree,
call_site: Span,
) -> ExpandResult<TopSubtree>