#setenv script_keepwork true

#go run main.go
#contains stderr "1"

godebugtester run main.go 
contains stderr "1"

-- go.mod --
module main
-- main.go --
package main
func main(){
	for a,b:=range f1() {	
		_,_=a,b
	}
	println(v1)
}
var v1 int
func f1() []int{
	v1++
	return nil
}
