Disable backing out merges?

[Matt Mackall]

On Sun, 2011-10-09 at 00:59 +0200, Arne Babenhauserheide wrote:
> Am Samstag, 8. Oktober 2011, 12:45:51 schrieb Matt Mackall:
> > On Sat, 2011-10-08 at 15:19 +0200, Arne Babenhauserheide wrote:
> 
> > > a-b-c-x ← broken
> > >  \   / 
> > >    d
> > > 
> > > A backout of c would need to make x a valid changeset,
> > 
> > I lost you right here. There are two completely different cases I'm
> > interested in:
> > 
> > a) merge should not have been done at all (ie merged default into
> > stable)
> > b) merge was done incorrectly (ie accidentally dropped changes)
> > 
> > This doesn't appear to be either of those. Backing out a non-merge
> > changeset like c is generally not a problem:
> 
> Sorry that the graphics were not clear. c is a merge between b and d. 

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-- 
Mathematics is the supreme nostalgia of our time.