not a very informative error message

[Matt Harbison]

On Sat, 08 Aug 2015 21:11:40 -0400, Matt Harbison <mharbison72 at gmail.com>  
wrote:

> On Fri, 07 Aug 2015 07:19:38 -0400, Neal Becker <ndbecker2 at gmail.com>  
> wrote:
>
>> $ hg id
>> 1f8f96084e75+ (collision) tip
>>
>> $ hg cat -r 1f8f96084e75+ test_awgn.py > /dev/null
>                01234567890123
>
>> hg: parse error at 13: not a prefix: end
>
> Since this isn't a valid revision or revset, all it can tell you is that  
> the problem occurred at the 13th character.
>
> I'm not sure what you are trying to do here.  The '+' on the end of the  
> revision simply means that the working directory is dirty- it isn't part  
> of the revision value.  So either you want the content of the committed  
> file (use 1f8f96084e75) or you want the content in the uncommitted  
> working directory.  The latter isn't implemented yet [1].

I should have tried this first.  'wdir()' seems to work in 3.5 with some  
quick testing, but it is still experimental AFAIK.  It also looks  
problematic for largefiles.