#5561 crash: Assertion `scores.size () > 0' failed.

[Werner LEMBERG]

[cf7be2a0d5093fb890083d09c1e320d8e06d3991]

This small input file

{
  \omit Stem
  \omit NoteHead

  b( b)
}

makes lilypond crash with

lilypond: slur-scoring.cc:767:
  std::vector<Slur_configuration*>
  Slur_score_state::enumerate_attachments(Drul_array<double>) const:
  Assertion `scores.size () > 0' failed.

[Malte Meyn]

Hm … is it really a bug that LilyPond cannot find a nice slur config if it has nothing to attach the slur to?

If you need an invisible attachment point, you can use point-stencil:

{
  \omit Stem
  \override NoteHead.no-ledgers = ##t
  \override NoteHead.stencil = #point-stencil

  b( b)
}

[David Kastrup]

"Malte Meyn" maltem@users.sourceforge.net writes:

Hm … is it really a bug that LilyPond cannot find a nice slur config
if it has nothing to attach the slur to?

No, but the reaction should not be a failed assertion but a warning and
some fallback behavior. Failed assertions are for conditions the
programmer considers indicative of a condition where the program cannot
safely continue. Programming errors are for conditions that are
unexpected but where a reasonably safe way of continuing suggests
itself. Errors are for invalid input, warnings are for invalid
conditions.

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David Kastrup

[Malte Meyn]

This one will be fixed together with [#5562].

[Malte Meyn]

This was fixed together with [#5562]:

commit 7e6a95662522ef586614bf547539b2b05e4afb23 (HEAD -> malte/crash-slur-5562, origin/staging)
Author: Malte Meyn lilypond@maltemeyn.de
Date: Mon Sep 30 16:58:59 2019 +0200

Issue 5561/5562: slurs work without NoteHead stencil

While searching for slur configurations LilyPond crashed on NoteHeads
without stencil because of empty extents. Also, when there cannot be
found a viable slur config, this is reported as a warning rather than a
failed assertion.