A JIT(Just-in-Time) compiler is just a program that generates native machine executable code at runtime. [Copy and Patch](https://arxiv.org/abs/2011.13127) is a new fast compilation technique developed rather recently. The general idea is that compilation normally requires multiple steps, thus making compilation slow (recall how many steps your SICP meta-circular evaluator needs to execute JS)! Copy and patch makes compilation faster by skipping all the intermediate steps, and just creating "templates" for
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