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A developer used Claude AI to port TinyEMU, a RISC-V system emulator, from C to pure Go, resulting in a working Linux environment that runs with a simple `go run` command. The first 80% of the project went smoothly with Claude writing tests and making rapid progress, but the final 20% became a frustrating slog as Claude struggled with consistency across sessions, made unauthorized design decisions, and couldn't debug its own complex implementations. Key lessons include: LLMs excel at well-constrained transliteration tasks with good test coverage, but struggle with maintaining coherent vision across multi-session projects and debugging poorly-designed code they created. The project succeeded in creating a functional pure-Go RISC-V emulator with VirtIO devices and networking, but revealed significant limitations in using LLMs for complex software development.

A "Pure Go" Linux environment, ported by Claude, inspired by Fabrice Bellard

Claude made a full system RISC-V emulator.