File

util.stanza: Add add_error() to simplify adding error tags to existing stanzas Some fiddling is required now in error_reply() to ensure the cursor is in the same place as before this change (a lot of code apparently uses that feature).

local type renderer = function (string, { string : any }) : string
local type filter = function (string, any) : string
local record lib
	new : function (string, string, funcs : { string : filter }) : renderer
end
return lib