I maintain a modified compiler (https://github.com/kstenerud/go/blob/master/README.md#the-go-programming-language https://github.com/kstenerud/go/blob/master/RE

I maintain a modified compiler (https://github.com/kstenerud/go/blob/master/README.md#the-go-programming-language https://github.com/kstenerud/go/blob/master/README.md#the-go...) that can issue warnings instead for unused things. I use it as my daily driver for go development. main.go: package main import "fmt" func main() { var start int = 1 breakOuter: // for x := start; x < 10; x++ { for x := 3; x < 10; x++ { for y := 0; y < 10; y++ { result := y * 10 + x // fmt.Printf("Result: %d\n", result) // if result == 42 { // fmt.Printf("Breaking") // break breakOuter // } } } } Building: $ go build # example ./main.go:3:8: imported and not used: "fmt" ./main.go:8:5: label breakOuter defined and not used (compilation fails) $ go build -gcflags=-warnunused # example ./main.go:8:5: Warning: label breakOuter defined and not used ./main.go:3:8: Warning: imported and not used: "fmt" ./main.go:6:9: Warning: start declared and not used ./main.go:12:13: Warning: result declared and not used (compilation succeeds)