Here's an example of the problem of darcs patches being mangled by  
mail agents.  This patch:

http://lists.osuosl.org/pipermail/darcs-devel/2008-February/007357.html

I wanted to apply, so I told my Mail User Agent, the Macintosh  
"Mail.app" program to "Save As".  The resulting file is attached as  
exhibit A.  When I tried to apply this file, I got:

-------
darcs failed:  Patch bundle failed hash!
This probably means that the patch has been corrupted by a mailer.
The most likely culprit is CRLF newlines.
-------

Then I did "Select All" and copied and pasted into a file attached as  
exhibit B.  When I darcs applied exhibit B it worked.

I just thought this example might help, since I saw some comments  
recently expressing uncertainty about what sort of mail mangling was  
happening in practice.

Regards,

Zooko

exhibit_A:

Attachments

• exhibit_A
• exhibit_B
• unnamed

dupe.