Comment by cryptonector

> It's crazy that this post seems to have stumbled across an equivalent to the Copy-and-Patch technique[0] used to create a Lua interpreter faster than LuaJit[1]

> this post relies on the Go compiler's closures to create copies of the functions with runtime-known values

To be clear the technique of using closures like this is ancient in the world of LISP. You can see in Paul Graham's books on LISP from the 90s, and in LiSP in Small Pieces, and many interpreters of 80s/90s vintage. I would say that it is quite standard.