From 445fc402e2ec1ba502e89a559275a861f743284f Mon Sep 17 00:00:00 2001
From: hanwen <hanwen>
Date: Mon, 3 Jun 2002 22:50:54 +0000
Subject: [PATCH] tremolo segfault

---
 Documentation/user/introduction.itely | 14 ++++++++++++++
 lily/stem.cc                          |  8 ++++++--
 lily/warn.cc                          |  1 +
 3 files changed, 21 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/user/introduction.itely

diff --git a/Documentation/user/introduction.itely b/Documentation/user/introduction.itely
new file mode 100644
index 0000000000..71c630166e
--- /dev/null
+++ b/Documentation/user/introduction.itely
@@ -0,0 +1,14 @@
+
+@node Introduction
+@chapter Introduction
+
+
+@section 
+
+@section Why LilyPond
+
+@section Music typography
+
+
+@section Automatic music printing
+
diff --git a/lily/stem.cc b/lily/stem.cc
index 16fa3f2579..ef0ed4ec3c 100644
--- a/lily/stem.cc
+++ b/lily/stem.cc
@@ -800,8 +800,12 @@ Stem::calc_stem_info (Grob*me)
 
   Real stem_length =  a[multiplicity <? (a.size () - 1)] * staff_space;
 
-  Direction first_dir = Directional_element_interface::get
-    (Beam::first_visible_stem (beam));
+  Grob *fvs = Beam::first_visible_stem (beam);
+
+  /*
+    Let's hope people don't use kneed tremolo beams.
+   */
+  Direction first_dir = fvs ? Directional_element_interface::get(fvs) : mydir;
 
   // FIXME, hairy.  see beam::calc_stem_y, for knees it's not trival
   // to calculate where secondary, ternary beams will go.
diff --git a/lily/warn.cc b/lily/warn.cc
index 492824563c..f942e1cda9 100644
--- a/lily/warn.cc
+++ b/lily/warn.cc
@@ -7,6 +7,7 @@
 */
 
 #include <stdio.h>
+
 #include "string.hh"
 
 void
-- 
2.39.5