I work on a company-internal compiler. We collect analytics on what kinds of syntax and type errors engineers have been encountering, compile times, and crash r

I work on a company-internal compiler. We collect analytics on what kinds of syntax and type errors engineers have been encountering, compile times, and crash reports. They've been invaluable - we've squashed some gnarly performance issues with some degenerate constructs, caught a few performance regressions post-release, and spent time polishing the type errors and semantics of the ones most encountered.