cp foo.orig.go foo.go
! gofumpt -w -r foo foo.go
stderr 'the rewrite flag is no longer available; use "gofmt -r" instead\n'
cmp foo.orig.go foo.go

gofumpt -w -s foo.go
stderr 'warning: -s is deprecated as it is always enabled\n'
cmp foo.go foo.go.golden

gofumpt -d foo.go.golden
! stdout .

-- foo.orig.go --
package p

func f() {

	println("foo")

}
-- foo.go.golden --
package p

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