Fix: properly handle recover in nested defer functions

[divinerapier]

修复嵌套 defer 函数中的 recover 无法正确捕获 painc

测试代码如下:

package main

import "fmt"

func main() {
	fmt.Println("testRecover")
	testRecover()

	fmt.Println("testNestedRecover")
	testNestedRecover()

	fmt.Println("main end")
}

func foo() {
	panic("foo panic")
}

func testRecover() {
	defer func() {
		if err := recover(); err != nil {
			fmt.Println("recover: ", err)
		}
	}()

	foo()

}

func testNestedRecover() {
	defer func() {
		defer func() {
			if err := recover(); err != nil {
				fmt.Println("recover: ", err)
			}
		}()
	}()

	foo()
}

运行结果:

go run test_recover.go
testRecover
recover:  foo panic
testNestedRecover
panic: foo panic

goroutine 1 [running]:
main.foo(...)
        /Users/divinerapier/test_recover.go:16
main.testNestedRecover()
        /Users/divinerapier/test_recover.go:39 +0x4c
main.main()
        /Users/divinerapier/test_recover.go:10 +0x88
exit status 2

运行结果未按照期望输出 main end

[Harry-zklcdc]

recheck

[github-actions]

Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

---

I have read the CLA Document and I hereby sign the CLA

---

_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}