code: function throwSyntaxError(message, errorLine, size) {
  		errorLine = errorLine === undefined ? line : errorLine
  		size = size === undefined ? 1 : size
  		var snippet = getSnippet(source, errorLine, size),
  			err = new SyntaxError(message + '\n' + snippet)
  		err.line = errorLine
  		throw err
  	}
docs: Throw a syntax error in the current position
  @param {string} message
  @param {number} [errorLine=line]
  @param {number} [size=1]
  @throws {SyntaxError}
  @private