[Haskell-beginners] System.USB.writeInterrupt -- confused by error message from type system

[emacstheviking]

Thanks for assist Brent!    (Always wanted to say that etc).

Well, this was the first time that it has ever happened to me and so I
guess I didn't appreciate the underlying cause.... once bitten and all that.

Thanks again everybody!
:)



On 27 February 2013 21:24, Brent Yorgey <byorgey at seas.upenn.edu> wrote:

> On Wed, Feb 27, 2013 at 09:06:30PM +0000, emacstheviking wrote:
> > HURRAH! I have finally got it to compile...
> >
> > I manually deleted the broken packages (I play too much anyway so a tidy
> up
> > was in order) and it still failed with:
> >
> > [1 of 1] Compiling Main             ( usb1.hs, usb1.o )
> >
> > usb1.hs:64:28:
> >     Couldn't match expected type
> > `bytestring-0.9.2.1:Data.ByteString.Internal.ByteString'
> >                 with actual type `ByteString'
>
> Glad you got it to work!  For future reference, the fact that the
> error message includes a package name and version number
> (bytestring-0.9.2.1:Data.ByteString.Internal.ByteString instead of
> just Data.ByteString.Internal.ByteString) is usually a very strong
> indication that the real problem is multiple versions of the package
> interfering with one another.
>
> -Brent
>
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