[PATCH RFC] run-tests: support per-line conditional output in tests

[Jun Wu]

Excerpts from Matt Harbison's message of 2017-04-06 20:06:02 -0400:
> On Thu, 06 Apr 2017 18:27:31 -0400, Jun Wu <quark at fb.com> wrote:
> 
> > Excerpts from Matt Harbison's message of 2017-04-04 00:01:55 -0400:
> >> The only thing that I haven't figured out yet is why the '(glob)'  
> >> interferes
> >> in the first hardlink.t hunk.  If it is kept, that line falls to the  
> >> bottom of
> >> the (xxx ?) sequence on Windows.  As it is, this test runs cleanly on  
> >> Linux.
> >
> > From 6a672c3b7860, it seems we may be able to just say 2 there:
> >
> >   -  ? r4/.hg/cache/checklink-target (glob)
> >   +  2 r4/.hg/cache/checklink-target
> 
> Interesting.  That's the commit that changed it from a number to the glob,  
> so I assumed that it was important.  I did manage to fix the issue, and  
> don't have OS X in front of me, so I'll leave that alone for now.

The minus and plus signs are the change I think we can make, not the patch
introduced.

6a672c3b7860 is inconsistent about "checklink-target" it added to the test.
One of them uses "?", the other uses "2". So I think we can change it to "2"
without issues.

> 
> > I like this feature.