What is @return?

[Benjamin Thaut via Digitalmars-d-learn]

On Thursday, 29 January 2015 at 11:50:29 UTC, FG wrote:
>
>     @property auto info() @safe @nothrow @pure @return const { 
> return this; }
>
> It is mesmerizing...   (@ _ @)

And soon its gong to look like this:

export @property auto info() @safe @nothrow @pure @return const { 
return this; }