[Lilypond-auto] Issue 3126 in lilypond: Fails to return a book created inside #{..#} substitution music function

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Defect

New issue 3126 by address@hidden: Fails to return a book created  
inside #{..#} substitution music function
http://code.google.com/p/lilypond/issues/detail?id=3126

Jay Anderson reported here:

http://lists.gnu.org/archive/html/bug-lilypond/2013-01/msg00123.html

that version 2.16.1 no longer returns a Lilypond book structure from within  
a substitution music function.

David Kastrup responded to say that he has a fix ready to push.

These functions are documented here:

http://lilypond.org/doc/v2.17/Documentation/notation/substitution-function-syntax

Original post follows.

In 2.16.0 creating a book inside #{ #} returned the book. In 2.16.1 and
2.16.2 this is no longer always the case. Here's an example which fails:

============
\version "2.16.2"

makeBook =
#(define-void-function (parser location) ()
  (let ((the-book
    #{
      \book
      {
        \include "header.ily"
        \score
        {
          \new Staff
          {
            c'1
          }
        }
      }
    #}))
    (display the-book) ;;; in 2.16.2 #<undefined>
    (newline)
    (print-book-with-defaults parser the-book)))

\makeBook
============

header.ily just contains:
============
\header
{
}
============

If you take the \include out or put the header inline it compiles, but that
defeats the purpose.

I just tried 2.17.10 and the behavior is fixed there.

-----Jay