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ndmitchell / cmdargs

Haskell library for command line argument processing
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Using `&= help` with `&= argPos` throws an error #56

Open aviaviavi opened 5 years ago

aviaviavi commented 5 years ago

I can use argPos just fine, but if I add a help param, I get 

CallStack (from HasCallStack):
  error, called at ./System/Console/CmdArgs/Implicit/Local.hs:106:11 in cmdargs-0.10.20-F07nW8QLYyL7Sb2sj6I5zi:System.Console.CmdArgs.Implicit.Local

Is there another way I'm supposed to be documenting positional arguments? If so, a better error message and docs to show this would be helpful, ideally it shouldn't type check.

I'm using stack with ghc 8.4.3, if it matters

aviaviavi commented 5 years ago

If this is a small contained thing to fix that no one else is or has been working on, I'd be happy to take a swing at it, let me know!