Jacob Carlborg:
AST macros are drawing so much attension. For some, it's like the holy grail.
That's a bad approach to technology design. You first need to create a good list of things that you want to do, then you have to try to do them without new features, and then if something important is not possible without the new feature (or it becomes too much ugly, too much long, too much bug-prone, etc), you have to see if the complexity of introducing the new feature is paid back. Macros are a significant feature, so they have a significant cost in code complexity, language dis-uniformity, ecc.
Bye, bearophile
