There was a similar project to `go fix` with elm-upgrade (https://github.com/avh4/elm-upgrade). We migrated a ~100k LOC app at work from 0.18 to 0.19 and while it was tedious, the compiler really has your back and makes it easier.
We weren't bit by the removal of native/kernel code, but it definitely turned a lot of people away that may have been committed to Elm before.
We weren't bit by the removal of native/kernel code, but it definitely turned a lot of people away that may have been committed to Elm before.