@future attribute / @future keyword?

[WebFreak001]

I have read about @future before being some kind of opposite of 
deprecated. However when trying to search about it now again I 
can't find any mentions of it anywhere except on 
https://dlang.org/spec/traits.html#isFuture

It's difficult enough to search for "future" but even if limiting 
it to the spec it's the only search result: 
https://www.google.com/search?domains=dlang.org&sourceid=google-search&q=%40future&sitesearch=dlang.org%2Fspec

There is this "future compiler concept": 
https://forum.dlang.org/post/hjdstwzhcbrektlijvhm@forum.dlang.org
which now is however leads to a dead link, so here is a fixed 
link: 
https://github.com/dlang/DIPs/blob/master/DIPs/accepted/DIP1007.md

In the grammar @future isn't mentioned at all, has it been 
removed from the language but the trait was left over?

Maybe the documentation here should be improved to avoid 
confusion.