Metalinks in Pharo:
https://www.slideshare.net/mobile/MarcusDenker/lecture-advanced-reflection-metalinks
This is an elegant way of taking the AST of running code and attaching modifiers to it: logging, tracing, override (think advice or AOP).
Pharo feels like the most open, dynamic language I've seen outside of f-expression based PLs.
miniblog.
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