DIP 50 - AST macros

[SomeDude]

On Monday, 18 November 2013 at 22:09:35 UTC, Dicebot wrote:
> 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.

And that's exactly the kind of thing Walter doesn't want to see.