code: function (codePath, node) {
          funcInfo = {
            upper: funcInfo,
            codePath: codePath,
            hasReturn: false,
            shouldCheck: TARGET_NODE_TYPE.test(node.type) &&
                         node.body.type === 'BlockStatement' &&
                         isCallbackOfArrayMethod(node)
          }
        }
docs: Stacks this function's information.