Problems encountered in upgrading golang to version 1.18.4

background

Used before golang Outdated Version Upgrade to the latest 1.18.4 edition
There are several problems when compiling the project
Document solutions

problem

1. misuse of unbuffered os.Signal channel as argument to signal.Notify

translate ： Abuse unbuffered os.Signal Channel as signal.Notify Parameters of
Code

ch := make(chan os.Signal)
signal.Notify(ch, syscall.SIGUSR1, syscall.SIGUSR2)

You can find the channel we created ch No, buffer So I made a mistake But before using the old version go It's always possible
To
Check the description of the package https://pkg.go.dev/os/signal#Notify

Clearly written We must use a buffered channel or risk missing the signal
It must be buffered chan So change it according to the example

ch := make(chan os.Signal,1)

2. conversion from int to string yields a string of one rune, not a string of digits (did you mean fmt.Sprint(x)?)

Code

func Test_func(t *testing.T) {
    
	var v int
	v = 65
	fmt.Println(string(v))
}

The question is int Use it directly string Forced conversion
The old version Even as rune The result of conversion is A No errors are reported
however 1.18.4 In this case, an error will be reported
If you want to output as "A"
It can be changed to

string(rune(v))

If you want to output "65"
It can be changed to

fmt.Sprint(v)
// perhaps 
strconv.Itoa(v)