From 5c63a28bd87431364a78d7bfcfaf4482a78d3f67 Mon Sep 17 00:00:00 2001
From: David Kastrup <dak@gnu.org>
Date: Fri, 12 Jun 2015 17:34:17 +0200
Subject: [PATCH] smobs.hh: mention that GUILE 1 gives callable structs at most
 3 args

---
 lily/include/smobs.hh | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lily/include/smobs.hh b/lily/include/smobs.hh
index e95637cb7c..3bcec9931e 100644
--- a/lily/include/smobs.hh
+++ b/lily/include/smobs.hh
@@ -213,7 +213,12 @@ private:
   }
 
   // Well, function template argument packs are a C++11 feature.  So
-  // we just define a bunch of trampolines manually.
+  // we just define a bunch of trampolines manually.  It turns out
+  // that GUILE 1.8.8 cannot actually make callable structures with
+  // more than 3 arguments anyway.  That's surprising, to say the
+  // least, but in emergency situations one can always use a "rest"
+  // argument and take it apart manually.
+
   template <SCM (Super::*pmf)(void)>
   static SCM smob_trampoline (SCM self)
   {
-- 
2.39.5