cue export --out yaml ./hello
cmp stdout expect-stdout
-- expect-stdout --
message: Hello World!
test: {}
-- hello/data.cue --
package hello

_who: "World"
-- hello/hello.cue --
package hello

message: "Hello \(_who)!" // who declared in data.cue

test: {
	_foo: string // technically in error, but test anyway.
	if *(len(_foo) > 0) | false {
		command: ["foo", "bar"]
	}
}
-- hello/cue.mod --