     else
       @versions[string] =
         Symbol.parse "#{@key}-v#{@nversions++}", result, @dirname
+  usesContext: true
 
 ## Symbol to fall back to when encountering an unrecognized symbol.
 ## Path from https://commons.wikimedia.org/wiki/File:Replacement_character.svg

    symbols =
      for row, i in symbols
        for symbol, j in row
          if symbol?.use?
            symbol = symbol.use new Context symbols, i, j
          symbolsByKey[symbol?.key] = symbol
    ## Include all used symbols in SVG
    for key, symbol of symbolsByKey
      continue unless symbol?

    ###
    encodeURIComponent @key
    .replace /%/g, '$'
  use: -> @  ## do nothing for static symbol
  usesContext: false

class DynamicSymbol extends Symbol
  constructor: (@key, @func, @dirname) ->
