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

[Francesco Ariis]

On Fri, Apr 24, 2015 at 11:49:15PM +0700, Matthew Moppett wrote:
>     Perhaps you meant one of these:
>       `C.isEmptyMVar' (imported from Control.Concurrent),

Haskell is case sensitive, isEmptyMVar is different from isEmptyMvar
(lowercase v)