Add regtest for music argument semantics of make-relative macro

diff --git a/input/regression/make-relative-music.ly b/input/regression/make-relative-music.ly
new file mode 100644 (file)
index 0000000..58266b2
--- /dev/null
+++ b/input/regression/make-relative-music.ly
@@ -0,0 +1,32 @@
+\version "2.19.0"
+
+\header {
+  texidoc = "@code{make-relative} can make relativization on music
+function calls behave as one would expect from looking at the
+function's arguments rather than at the actually resulting
+expressions.  This regtest defines an example function
+@code{\\withOctave} which works equally well inside and outside of
+@code{\\relative}." 
+}
+
+withOctave =
+#(define-music-function (parser location music)
+  (ly:music?)
+  (make-relative
+   (music) music
+   #{ \context Bottom << $music \transpose c c' $music >> #}))
+
+mus = {
+  \partial 4. c'8 e g |
+  c2 e,4 g |
+  c,8 c' b a <g d'> <f c'> <e b'> <d a'> |
+  <c g'>1 | \bar "|."
+}
+
+<<
+  \relative \new Staff { <>^"original" \mus }
+  \relative \new Staff { <>^\markup \typewriter "\\relative \\withOctave"
+                        \withOctave \mus }
+  \new Staff { <>^\markup \typewriter "\\withOctave \\relative"
+              \withOctave \relative \mus }
+>>