Make arguments like Context.GrobName accessible as symbol lists

Documentation/snippets/printing-bar-numbers-inside-boxes-or-circles.ly

 %% DO NOT EDIT this file manually; it is automatically
 %% generated from LSR http://lsr.dsi.unimi.it
 %% Make any changes in LSR itself, or in Documentation/snippets/new/ ,
 %% and then run scripts/auxiliar/makelsr.py
 %%
 %% This file is in the public domain.
-\version "2.17.5"
+\version "2.17.6"
 
 \header {
   lsrtags = "rhythms, tweaks-and-overrides"
 
   texidoc = "
 Bar numbers can also be printed inside boxes or circles.
 
 "
   doctitle = "Printing bar numbers inside boxes or circles"
 } % begin verbatim
 
 
 \relative c' {
   % Prevent bar numbers at the end of a line and permit them elsewhere
-  \override Score.BarNumber break-visibility = #end-of-line-invisible
+  \override Score.BarNumber.break-visibility = #end-of-line-invisible
   \set Score.barNumberVisibility = #(every-nth-bar-number-visible 4)
 
   % Increase the size of the bar number by 2
-  \override Score.BarNumber font-size = #2
+  \override Score.BarNumber.font-size = #2
 
   % Draw a box round the following bar number(s)
-  \override Score.BarNumber stencil
+  \override Score.BarNumber.stencil
     = #(make-stencil-boxer 0.1 0.25 ly:text-interface::print)
   \repeat unfold 5 { c1 }
 
   % Draw a circle round the following bar number(s)
-  \override Score.BarNumber stencil
+  \override Score.BarNumber.stencil
     = #(make-stencil-circler 0.1 0.25 ly:text-interface::print)
   \repeat unfold 4 { c1 } \bar "|."
 }