ace-code-editor/lib/ace/mode/_test/text_ruby.txt

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 #test: symbol tokenizer
  [:@thing, :$thing, :_thing, :thing, :Thing, :thing1, :thing_a,
              :THING, :thing!, :thing=, :thing?, :t?,
              :, :@, :$, :1, :1thing, :th?ing, :thi=ng, :1thing,
            :th!ing, :thing#
    ]

 #test: namespaces aren't symbols" : function() {
   Namespaced::Class
 #test: hex tokenizer 
    0x9a, 0XA1, 0x9_a, 0x, 0x_9a, 0x9a_,
 #test: float tokenizer
    [1, +1, -1, 12_345, 0.000_1,
    _, 3_1, 1_2, 1_.0, 0._1];
 
{:id => ?", :key => "value", anotherKey: [x, y?]}

=begin
=end

=begin x
=end-
=end   x

    herDocs = [<<'FOO', <<BAR, <<-BAZ, <<-`EXEC`] #comment
  FOO #{literal}
FOO
  BAR #{fact(10)}
BAR
  BAZ indented
    BAZ
        echo hi
    EXEC
puts herDocs