code: function() {
      this.appendDummyInput('TOPROW')
          .appendField('', 'NAME');
      this.setOutput(true);
      this.setColour(Blockly.Blocks.procedures.HUE);
      // Tooltip is set in domToMutation.
      this.setHelpUrl(Blockly.Msg.PROCEDURES_CALLRETURN_HELPURL);
      this.arguments_ = [];
      this.quarkConnections_ = {};
      this.quarkIds_ = null;
    }
docs: Block for calling a procedure with a return value.
  @this Blockly.Block