Make arguments like Context.GrobName accessible as symbol lists

Documentation/snippets/non-default-tuplet-numbers.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 "2.16.0"
+\version "2.17.6"
 
 \header {
   lsrtags = "rhythms"
 
   texidoc = "
 LilyPond also provides formatting functions to print tuplet numbers
 different than the actual fraction, as well as to append a note value
 to the tuplet number or tuplet fraction.
 
 "
   doctitle = "Non-default tuplet numbers"
 } % begin verbatim
 
 \relative c'' {
-  \once \override TupletNumber #'text =
+  \once \override TupletNumber.text =
     #(tuplet-number::non-default-tuplet-denominator-text 7)
   \times 2/3  { c4. c4. c4. c4. }
-  \once \override TupletNumber #'text =
+  \once \override TupletNumber.text =
     #(tuplet-number::non-default-tuplet-fraction-text 12 7)
   \times 2/3  { c4. c4. c4. c4. }
-  \once \override TupletNumber #'text =
+  \once \override TupletNumber.text =
     #(tuplet-number::append-note-wrapper
       (tuplet-number::non-default-tuplet-fraction-text 12 7) "8")
   \times 2/3  { c4. c4. c4. c4. }
 
-  \once \override TupletNumber #'text =
+  \once \override TupletNumber.text =
     #(tuplet-number::append-note-wrapper
       tuplet-number::calc-denominator-text "4")
   \times 2/3  { c8 c8 c8 c8 c8 c8 }
-  \once \override TupletNumber #'text =
+  \once \override TupletNumber.text =
     #(tuplet-number::append-note-wrapper
       tuplet-number::calc-fraction-text "4")
   \times 2/3  { c8 c8 c8 c8 c8 c8 }
 
-  \once \override TupletNumber #'text =
+  \once \override TupletNumber.text =
     #(tuplet-number::fraction-with-notes "4." "8")
   \times 2/3  { c4. c4. c4. c4. }
-  \once \override TupletNumber #'text =
+  \once \override TupletNumber.text =
     #(tuplet-number::non-default-fraction-with-notes 12 "8" 4 "4")
   \times 2/3  { c4. c4. c4. c4. }
 }