> On Jun 29, 2017, at 9:33 AM, David Kastrup <d...@gnu.org> wrote: > > Stan Sanderson <stans...@gmail.com <mailto:stans...@gmail.com>> writes: > >>> On Jun 28, 2017, at 8:53 PM, Stanton Sanderson <stans...@gmail.com> wrote: >>> >>> >>>> On Jun 28, 2017, at 8:48 PM, Andrew Bernard <andrew.bern...@gmail.com> >>>> wrote: >>>> >>>> Hi Stan, >>>> >>>> See LSR: >>>> >>>> http://lsr.di.unimi.it/LSR/Item?id=900 >>>> >>>> Andrew >>>> >>> >>> Andrew, >>> >>> I should have known to check the LSR but failed to do so. >> >> Now that I’ve had time to try it, the snippet doesn’t compile (with >> 2.19.63) as is, and I’m still wondering >> what I’m doing. >> >> Error message: >> >> Parsing... >> Interpreting music... >> Preprocessing graphical >> objects.../home/gub/NewGub/gub/target/darwin-x86/src/lilypond-git.sv.gnu.org--lilypond.git-release-unstable/lily/grob-property.cc:242: >> failed assertion `scm_is_null (value) || scm_is_eq (value, marker)' >> Exited with exit status 1. > > The LSR sample is broken since instead of _returning_ a proper stencil > from the grob callback, it _overrides_ the grob callback with the > stencil. This confuses LilyPond's internals enough that it will abort. > > Basically you need to replace > > (set! (ly:grob-property grob 'stencil) > [whatever] ) > > with just > [whatever] > > whenever it occurs in the callback. Be sure to remove one closing paren > after [whatever] in order to maintain matched parens. > > -- > David Kastrup
Thank you David (for the solution), Pierre (for the LSR update) and Andrew (for the suggestion). Stan
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