go work use -r foo
cmp go.work go.want_work_r

! go work use other
stderr '^go: error reading other'${/}'go.mod: missing module declaration'

go mod edit -C other -module=other
go work use other
cmp go.work go.want_work_other
-- go.work --
go 1.18

use (
	foo
	foo/bar // doesn't exist
)
-- go.want_work_r --
go 1.18

use (
	./foo
	./foo/bar/baz
)
-- go.want_work_other --
go 1.18

use (
	./foo
	./foo/bar/baz
	./other
)
-- foo/go.mod --
module foo
-- foo/bar/baz/go.mod --
module baz
-- other/go.mod --