Comment by vidarh

Yeah, I've had Claude work on my buggy, incomplete Ruby compiler written (mostly) in Ruby, which uses an s-expression like syntax with a custom "mini language" to implement low-level features that can't be done (or is impractical to do) in pure Ruby, and it only had minor problems with the s-expression language that was mostly fixed with a handful of lines in CLAUDE.md (and were, frankly, mostly my fault for making the language itself somewhat inconsistent) and e.g. when it write a bigint implementation, I had to "tell it off" for too readily resorting to the s-expression syntax since it seemed to "prefer it" over writing high-level code in Ruby.