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The official Haxe sources:
- https://haxe.org/manual/macro.html
- http://api.haxe.org/haxe/macro/
- http://code.haxe.org/category/macros/
Getting better all the time, this is the definitive guide though quite meaty and requires a good couple of passes before things make sense. Learn from simple examples and practicing, use the manual as a reference.
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Macronauts: Macro workshop