I've just noticed that function parameters appear in the symbol tree too - we normally don't display those (and this is where we use the "special" `tm_tag_local_var_t`). But as I understand it, parameters are shared in the ctags parser together with constants and you map them `tm_tag_field_t`, am I right? In that case hiding parameters would also hide constants from the symbol tree so I guess what you did is the better option.