# File lib/sass/script/functions.rb, line 1282 def append(list, val, separator = Sass::Script::String.new("auto")) assert_type separator, :String unless %w[auto space comma].include?(separator.value) raise ArgumentError.new("Separator name must be space, comma, or auto") end sep = list.separator if list.is_a?(Sass::Script::List) Sass::Script::List.new( list.to_a + [val], if separator.value == 'auto' sep || :space else separator.value.to_sym end) end