code: function _getReturns(node, returnsArr) {
    return returnsArr.filter(returnResult =>
      Boolean(node.loc.start.line === returnResult.funcLine)
    );
  }
docs: Private: finds `ReturnStatement` {Node}s within a function.
  
  * `node` {Node} Spidermonkey AST node.
  * `returnsArr` {Array} of {ReturnResult}s from parsing all the `ReturnStatement` {Node}s.
  
  Returns {Array} of {ReturnResult}s that have definitions that are contained within
  the `node` `start` and `end`.