Funny enough two of the attributes you mentioned (pure and nothrow) don't have an @ on them. Maybe I'm strange, but I don't see any problem with the @, and would actually like to see some of the other attributes (including pure and nothrow) adopt them, for consistancy and to free up names. Surely you don't think "safe" should be a keyword? Or "trusted" or "system"?
All are having the @ added: http://wiki.dlang.org/DIP64
