1\version "2.19.21"
2#(ly:set-option 'warning-as-error #f)
3#(ly:expect-warning (_ "No such instrument: ~a") "bassClar")
4
5\header {
6  texidoc = "The @code{switchInstrument} music function prints a warning if
7the given instrument definition does not exist."
8}
9
10\relative
11{
12  c'4
13  \instrumentSwitch "bassClar"
14  c
15}
16