[Haskell-beginners] Strange "Not in scope" error message

[Alex Hammel]

You forgot to capitalize the 'V' in 'isEmptyMVar' :)

On Fri, 24 Apr 2015 at 09:49 Matthew Moppett <matthewmoppett at gmail.com>
wrote:

> I have a file with the following relevant lines:
>
> import qualified Control.Concurrent as C
>
> ...
>
> isCancelled = C.isEmptyMvar . stopConcurrentProcess
>
> Trying to compile this or run it in ghci yields a puzzling error message:
>
> Not in scope: `C.isEmptyMvar'
>     Perhaps you meant one of these:
>       `C.isEmptyMVar' (imported from Control.Concurrent),
>       `C.isEmptyChan' (imported from Control.Concurrent)
>
> Any idea what could be going wrong?
>
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