To combine both TFA with this comment: I find that LLMs are ~fine at generating/editing gocode, or at least as ~fine as they generate most mainstream languages.
But good god, the second it gets to anything concurrency-related, it just loses its mind. As much as it's gotten vaguely ok to try to let the agents loose on some bits of the codebase, they simply can't even do table stakes stuff with the kinds of concurrency you see in real life.
My experience as well. LLMs also struggle with Rust's many abstractions and offerings but you can know that if it compiles it is data race free and work with the LLM to use better abstractions over time.
Zig is also good at this but requires more up front design (thread-per-core, static allocation, etc.) and consistent checks to verify rules are followed.
I wouldn't be surprised if Java has a much better experience here. After all, java.util.concurrent has many great implementations, and Java's `record`s are immutable, as are it's upcoming value types.
Correct concurrent code is mind-bogglingly hard even for seasoned veteran humans (and don't get me started on distributed programming...), so it's hardly surprising that LLMs with their limited context windows into the code have a hard time writing correct concurrent code