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Here is where TCO is implemented in the Coconut compiler code: https://github.com/evhub/coconut/blob/07e311fb8f69861d30e58f0de7861f2ef7351503/coconut/compiler/

• zbentley 8y ago
  That's clever and horrifying. Clever because writing a regex-based preprocessor for a complex, dynamic language that adds TCO and actually works in most cases is impressive. Horrifying because . . . it's a regex based preprocessor that rearranges arbitrary function code in a complex, dynamic language.