Hi,
I tried to use the error contexts of elm-tools/parser to improve the error messages. There is not much to see and this is far from perfect, but hopefuly this can be helpful to get started with this library:
Feedback is welcome, particularly if you find some issue or if you have some idea how to make the chainLeft function more readable (or anything else).
Note: I’m not sure if this is a good idea to put the Ellie link in the github README, tell me if it’s better to remove it.