Case-insensitive filename issues go undetected

[rtfeldman]

Encountered this on our Linux CI server, but could not reproduce locally on OS X:

Error when searching for modules exposed by elm-package.json:
    Could not find module 'Shrink'

Potential problems could be:
  * Misspelled the module name
  * Need to add a source directory or new dependency to elm-package.json

The fix? Change a file's extension from .Elm to .elm:

mv elm-stuff/packages/TheSeamau5/elm-shrink/2.2.0/src/Shrink.Elm elm-stuff/packages/TheSeamau5/elm-shrink/2.2.0/src/Shrink.elm

Then everything worked as expected.

Since OS X has a case-insensitive filesystem, this wasn't a problem locally.

[evancz]

cc @TheSeamau5

[Morendil]

Nice! I've been bitten by this when deploying to Heroku from a Mac. Glad to know what the problem was.

[raould]

If these things are being accepted and hosted on the http://package.elm-lang.org/package web site it would be nice to have a set of acceptance tests that could be added to over time.