From: David Kastrup <dak@gnu.org>
Date: Thu, 4 Oct 2012 13:44:25 +0000 (+0200)
Subject: Add symbol-list? predicate
X-Git-Tag: release/2.17.6-1~31
X-Git-Url: https://git.donarmstrong.com/?a=commitdiff_plain;h=14dc63a398d045f764fb6148e264b58c93bd2ab4;p=lilypond.git

Add symbol-list? predicate
---

diff --git a/scm/c++.scm b/scm/c++.scm
index 444a3e9ba6..d627481e5c 100644
--- a/scm/c++.scm
+++ b/scm/c++.scm
@@ -48,6 +48,9 @@
 (define-public (boolean-or-symbol? x)
   (or (boolean? x) (symbol? x)))
 
+(define-public (symbol-list? x)
+  (and (list? x) (every symbol? x)))
+
 (define-public (string-or-symbol? x)
   (or (string? x) (symbol? x)))
 
diff --git a/scm/lily.scm b/scm/lily.scm
index d7c4bf6587..c8e4de05f4 100644
--- a/scm/lily.scm
+++ b/scm/lily.scm
@@ -584,6 +584,7 @@ messages into errors.")
     (,string-or-pair? . "string or pair")
     (,string-or-music? . "string or music")
     (,string-or-symbol? . "string or symbol")
+    (,symbol-list? . "symbol list")
     (,void? . "void")
     ))