Merge with master

[lilypond.git] / lily / paper-book-scheme.cc

diff --git a/lily/paper-book-scheme.cc b/lily/paper-book-scheme.cc
index 6d2d983bc6f4ce1e2db7c71bdb8dabc36b35f347..01e777220b24655c19c0a860bcd32849a9392082 100644 (file)
--- a/lily/paper-book-scheme.cc
+++ b/lily/paper-book-scheme.cc
@@ -3,7 +3,7 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c) 2005--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  (c) 2005--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
 */
 
 #include "paper-book.hh"
@@ -49,5 +49,7 @@ LY_DEFINE (ly_paper_book_paper, "ly:paper-book-paper",
           1, 0, 0, (SCM pb),
           "Return pages in book PB.")
 {
-  return unsmob_paper_book (pb)->paper_->self_scm ();
+  Paper_book *pbook = unsmob_paper_book (pb);
+  SCM_ASSERT_TYPE(pbook, pb, SCM_ARG1, __FUNCTION__, "Paper_book");
+  return pbook->paper_->self_scm ();
 }