hg log -f -r : foo.cpp gives an error

[Matt Mackall]

On Fri, 2015-07-17 at 14:10 -0500, Matt Mackall wrote:
> On Fri, 2015-07-17 at 14:38 -0400, Bob Eby wrote:
> > Hi Everyone,
> > 
> > When I run:
> > 
> > hg log -f -r : foo.cpp
> 
> I have no idea what you'd expect this to do: following the history.. of
> all the history is a bit meaningless.
> 
> Or maybe you're just trying to control the order that's output.
> 
> > on my repository I get some kind of error:
> > 
> > hg: parse error at 1: not a prefix: end
> 
> The simplest version of this bug is:
> 
>  $ hg log -r "(:)"
>  hg: parse error at 2: not a prefix: )
> 
> And that's because ":" is not a valid revset (see hg help revsets), but
> IS a valid legacy specifier (which we silently fall back to when we
> can't parse something as a revset). Unfortunately, bare ":" is simply
> too ambiguous to be part of revsets in any useful way and most of us
> have forgotten it even exists.

And then Yuya Nishihara sent a series of patches to fix this precise
issue.. hours before I sent my email.

-- 
Mathematics is the supreme nostalgia of our time.