From 3cfbe76597441ea915603c4e6e60d3e660fce647 Mon Sep 17 00:00:00 2001
From: David Kastrup <dak@gnu.org>
Date: Wed, 12 Jan 2011 13:08:44 +0100
Subject: [PATCH] lily/stem-engraver.cc: Improve error message for incompatible
 durations while stemming

---
 input/regression/incompatible-stem-warning.ly | 22 +++++++++++++++++++
 lily/stem-engraver.cc                         | 10 +++++----
 2 files changed, 28 insertions(+), 4 deletions(-)
 create mode 100644 input/regression/incompatible-stem-warning.ly

diff --git a/input/regression/incompatible-stem-warning.ly b/input/regression/incompatible-stem-warning.ly
new file mode 100644
index 0000000000..95dc1c1d2c
--- /dev/null
+++ b/input/regression/incompatible-stem-warning.ly
@@ -0,0 +1,22 @@
+\version "2.13.59"
+
+\header {
+
+  texidoc = "
+Combine several kinds of stems in parallel voices.
+"
+
+}
+
+\new Voice { \time 4/1
+	     << c'\breve e'8 >>
+	     << c'8 e'\breve >> |
+	     << c'\longa e'1 >> |
+	     << c'1 e'\longa >> |
+	     << c'2 e'1 >>
+	     << c'1 e'2 >>
+	     << c'2 e'4 >>
+	     << c'4 e'2 >>
+	     << c'2 e'8 >>
+	     << c'8 e'2 >>
+}
diff --git a/lily/stem-engraver.cc b/lily/stem-engraver.cc
index 137040766a..e21d796765 100644
--- a/lily/stem-engraver.cc
+++ b/lily/stem-engraver.cc
@@ -134,11 +134,13 @@ Stem_engraver::acknowledge_rhythmic_head (Grob_info gi)
   if (!stem_)
     make_stem (gi);
 
-  if (Stem::duration_log (stem_) != d->duration_log ())
+  int ds = Stem::duration_log (stem_);
+
+  if (ds != d->duration_log ())
     {
-      // FIXME: 
-      gi.event_cause ()->origin ()->warning (_f ("adding note head to incompatible stem (type = %d)",
-						 1 << Stem::duration_log (stem_)));
+      gi.event_cause ()->origin ()->warning (_f ("adding note head to incompatible stem (type = %d/%d)",
+						 ds < 0 ? 1 << -ds : 1,
+						 ds > 0 ? 1 << ds : 1));
       gi.event_cause ()->origin ()->warning (_ ("maybe input should specify polyphonic voices"));
     }
 
-- 
2.39.5