1\version "2.19.80"
2
3\header {
4  texidoc = "@code{\\new} can create a child of the same type and name
5as its parent.  PASS should appear in the left margin."
6}
7
8\context StaffGroup = "B" \with { instrumentName = "PASS" } <<
9  \new StaffGroup = "B" {
10    %% This does not replace PASS because it is a new context, and
11    %% it is not engraved because this context contains no music.
12    \set StaffGroup.instrumentName = "FAIL"
13  }
14  s1
15>>
16