DIP 50 - AST macros

[Dicebot]

On Monday, 18 November 2013 at 21:09:26 UTC, Jacob Carlborg wrote:
> On 2013-11-18 16:59, Dicebot wrote:
>
>> Anything that allows it routinely should be banned whenever 
>> macros are
>> accepted or not. Modifying existing "normal" symbols = no way.
>
> The whole point of macros is to modify symbols. Turning this:
>
> auto p = Person.where(q => q.name == "John");
>
> To an SQL query.

You don't need to modify actual input lambda for this to become 
SQL query. I fully support macros as convenient way for AST 
reflection and related code generation but not a single step 
further. Changing semantics of existing valid piece of code is 
never worth it.