DIP 50 - AST macros

[deadalnix]

On Monday, 18 November 2013 at 05:05:02 UTC, Walter Bright wrote:
> On 11/17/2013 7:14 PM, deadalnix wrote:
>> As I understand it, Timon choosed that syntax simply to 
>> demonstrate the
>> limitation of your proposal using a similar syntax. Not to 
>> propose a syntax.
>
> Ok, then I'm not seeing what AST macros do that lazy parameters 
> / template overloading / mixin templates do not?

2 things. First, they can act on statement or declaration. Simply 
not with the proposed syntax. Second they can reflect what is 
passed as argument and act accordingly, when the lazy expression 
solution cannot.