I follow development a bit, but am not yet involved heavily. From what I gather, one of the goals of a 1.0 release is that any subsequent releases will have en

I follow development a bit, but am not yet involved heavily. From what I gather, one of the goals of a 1.0 release is that any subsequent releases will have enough tooling to painlessly upgrade to a new version. Something like a 'rust fix' command is surely how you'd want to implement that. Making such a tool shouldn't be enormously painful, given the infrastructure to pretty-print your code exists in the rust compiler.