beaming beats over rests

[Sean Reed]

on: lilypond 2.2.5, macos 10.3.5

is there a way to consistently put beams over rests within the same 
beat without getting a *warning: beam has less than two visible stems*?

i often write very complicated rhythms with many rests of different 
durations and many very short rhythms, and i and many instrumentalists 
find it easier to count the music when the beats are grouped together 
by beams which include the rests.

putting rests under beams seems to consistently work for more than two 
visible stems, for example: c16[ r8 c16], or c16[ d e r],

but not, for example, for c16[ r8.] or r8[ c8] or r8[ c16 r16].
with rhythms such as these i get the above warning (*less than two 
stems*).
sometimes the image on the page looks right despite the warnings,

but very often i get a crash with these errors:
../flower/include/array.hh:149: failed assertion `i >=0&&i<size_'
lilypond: error: LilyPond crashed (signal 6).
lilypond: error: Please submit a bug report to address@hidden
lilypond: warning: Running LilyPond failed. Rerun with --verbose for a 
trace.

am i using incorrect syntax?
is there a workaround?

thanks,
sean

------------------------------------------
Sean Reed
www.seanreed.de