[Rivet] Rivet crash when applying projection

[Hendrik Hoeth]

Thus spake Frank Siegert (frank.siegert at durham.ac.uk):

> I know that we use -O2 in Sherpa. Would anybody be opposed to
> switching Rivet to -O2?

That might be a work-around, but if optimisation breaks it, we better
find the bug and fix it properly.

> * Putting in one 'cout<<"nothing"<<endl;' makes the segfault go away,
> and valgrind doesn't show any errors in that case.

*sigh*

I hate that kind of bug.  :-(

See you on Monday,

     Hendrik

-- 
"Two equal numbers are equivalent, even if they come from two
 different people one of which you don't like"
(MLM about the theoretical top cross-section, in a meeting
about theoretical uncertainties on the top mass)