Error when compiling with 2.15.16 for \drums function

[Peekay Ex]

Hello,

While helping someone on the lists yesterday I noticed that a file
would not compile on 2.15.16 but was ok on 2.14.2.

Because of the error message it is I think something to do with the
new parsing changes and wanted to check because in the NR this command
is still listed as if it should be ok to use.

The tiniest example I could get is

\version "2.15.16"
\drums { hihat4 }

This gives a

GNU LilyPond 2.15.16
/home/jlowe/lilypond-git/build/out/share/lilypond/current/scm/lily.scm:530:3:
In expression (quasiquote (# # # ...)):
/home/jlowe/lilypond-git/build/out/share/lilypond/current/scm/lily.scm:530:3:
Unbound variable: ly:spring?

message.

Regards

-- 
--
James