Environment

windows10 

go1.20.1

Problem

When I compiled my code with go 1.20.1, I found that the results of the program executed with the -gcflags "all=-N -l" compiler flag were inconsistent with those without.

The code looks like this:

package main

func foo() {
	println("foo")
}

var list = []func(){
	func() {
		println("1")
	},
	func() {
		println("2")
	},
	func() {
		println("3")
	},
}

func main() {
	fn := foo
	for _, fn = range list {
		fn()
	}
}

Why is there a difference in program execution results when using the -gcflags "all=-N -l" compilation flag, and is this a bug?