code: public com.sun.javadoc.Type receiverType() {
          Type recvtype = sym.type.asMethodType().recvtype;
          return (recvtype != null) ? TypeMaker.getType(env, recvtype, false, true) : null;
      }
docs: Get the receiver type of this executable element.
  
  @return the receiver type of this executable element.
  @since 1.8