Hi Richard,

> The errors generated by tiny misuses of this package are disastrous.
> But, figuring out what went wrong from an error message would still be hard,
> even as a plugin.

Yes, it also feels a bit too heuristically and if GHC changes,
extensions get added or just activated, then the type errors might
change and the heuristics break.

> Instead, it would be much better if extra checks were put in place
> during typechecking; if these checks fail, then the errors are easier
> to diagnose.

Yes, this seems like a more stable approach.

Greetings,
Daniel

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