This time I tried with current git (commit 436824b8):
>> \version "2.17.6"
>>
>> {
>> f2 \glissando
>> \override NoteHead #'stencil = ##f
>> e |
>> }
>>
>> causes the following output (beautified):
>
> no such messages wit 2.17.7 - but there is no glissando; use
> transparent instead.
and I still get
../flower/include/interval.hh:226:
T Interval_t<T>::center() const [with T = double]:
Assertion `!is_empty ()' failed.
I'm on a GNU/Linux box, running `autogen.sh' with
`--disable-optimising', and compiling with g++ 4.6.2.
Regardless whether this useful or non-sensical input, there shouldn't
be a failed assertion.
Werner
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