[chadcmulligan]

fwiw LLM's seem very good at writing recursive descent parsers, at least for the small experiments I've done (wrote a Lua parser in Delphi).

[UncleOxidant]

Agreed. I recently had Gemini write a recursive descent parser for a specified subset of C in C and it did quite well. I've tried similar with Claude 4 and Qwen3 Coder and again, both did quite well.