gofumpt -w foo.go
cmp foo.go foo.go.golden

gofumpt -d foo.go.golden
! stdout .

-- foo.go --
package p

func f1() {

	println("multiple")

	println("statements")

}

func f2() {

	// comment directly before
	println()

	// comment after

}

func _() {
	f3 := func() {

		println()

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

func f1() {
	println("multiple")

	println("statements")
}

func f2() {
	// comment directly before
	println()

	// comment after
}

func _() {
	f3 := func() {
		println()
	}
}