Hi,

I wanted to play with the Io programming language and needed the Io  
interpreter build on my machine (iMac G5, OS X 10.4.8). The Io  
project uses Darcs for source control hence I first built Darcs using  
Darwin ports. This worked just fine according to the last few lines  
of build output:

--->  Archive darcs-1.0.8_1.powerpc.tgz packaged
--->  Archive for darcs 1.0.8_1 packaged
--->  Installing darcs 1.0.8_1
--->  Activating darcs 1.0.8_1
--->  Cleaning darcs
--->  Removing workpath for darcs

However while checking out the dev version of the Io interpreter I  
got the following Darcs error which I am emailing to this list as  
instructed by the error message:

[~/devel]
gkoller@kinchenna $ mkdir io

[~/devel]
gkoller@kinchenna $ cd io

[~/devel/io]
gkoller@kinchenna $ darcs get --partial http://www.iolanguage.com/ 
darcs/Io
Copying patch 649 of 649... done!
Applying patch 649 of 649... done.
darcs: bug in darcs!
Impossible case at PatchRead.lhs:56 compiled 14:49:43 Jan 16 2007
Please report this to bugs@darcs.net,
If possible include the output of 'darcs --exact-version'.

[~/devel/io]
gkoller@kinchenna $ date
Tue Jan 16 16:12:26 CET 2007

[~/devel/io]
gkoller@kinchenna $ darcs --exact-version
darcs compiled on Jan 16 2007, at 14:55:10
# configured Fri Jun 16 14:55:21 EDT 2006
./configure --no-create --no-recursion

Context:

[TAG 1.0.8
Tommy Pettersson <ptp@lysator.liu.se>**20060616160213]

[~/devel/io]
gkoller@kinchenna $ ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.6

Hi,

Thanks for the bug report.

On Wed, Jan 17, 2007 at 00:24:52 +0000, Guido Kollerie wrote:
> gkoller@kinchenna $ darcs get --partial http://www.iolanguage.com/darcs/Io
> Copying patch 649 of 649... done!
> Applying patch 649 of 649... done.
> darcs: bug in darcs!
> Impossible case at PatchRead.lhs:56 compiled 14:49:43 Jan 16 2007
> Please report this to bugs@darcs.net,
> If possible include the output of 'darcs --exact-version'.

I was unable to reproduce this with my MacBook, neither with 1.0.9rc2
nor 1.0.8 (N.B. with an Lcs.lhs from 1.0.9rc2 for ghc 6.6).  I have
also tried it with an iMac G4, darcs 1.0.8_1 from MacPorts.  Also the
same.

Weird, huh?  Any ideas, anybody?

This issue is now resolved-in-unstable because it a duplicate of a bug which has
become in the darcs unstable branch.