# gofumpt changes -s to default to true. Note that goimports, and thus
# gofumports, has no such flag.
gofumpt foo.go
[gofumpt] cmp stdout foo.go.golden
[!gofumpt] cmp stdout foo.go

-- foo.go --
package p

var _ = [][]int{[]int{1}}
-- foo.go.golden --
package p

var _ = [][]int{{1}}