[Haskell-beginners] System.USB.writeInterrupt -- confused by error message from type system
objitsu at gmail.com
Wed Feb 27 22:30:21 CET 2013
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
> > 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.
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