godebugtester run main.go
contains stdout "2"
fail contains stdout "3=(1 + 2)"
contains stdout "8=(6=(1 + 5) + 2)"

-- main.go --
package main
func main() {
	a:=1
	b:=2
	//godebug:annotateoff
	_=a+b
	//godebug:annotateblock
	_=a+5+b
}