code: public final String decompileFunctionBody(Function fun, int indent)
      {
          if (fun instanceof BaseFunction) {
              BaseFunction bf = (BaseFunction)fun;
              return bf.decompile(indent, Decompiler.ONLY_BODY_FLAG);
          }
          // ALERT: not sure what the right response here is.
          return "[native code]\n";
      }
docs: Decompile the body of a JavaScript Function.
  <p>
  Decompiles the body a previously compiled JavaScript Function
  object to canonical source, omitting the function header and
  trailing brace.
  
  Returns '[native code]' if no decompilation information is available.
  
  @param fun the JavaScript function to decompile
  @param indent the number of spaces to indent the result
  @return a string representing the function body source.