Macros: a visual aid.

[Walter Bright]

Chris Nicholson-Sauls wrote:
> Now that stands out!  So Walter, please consider some sort of decoration 
> (such as the '@') for macro invocations.  I think it may save some 
> future headaches, /and/ give the parser something to latch on to.

Part of the intent of macros is to make them look just like functions! 
(There also isn't any parsing issue, like there is for template 
invocations.)