Removing fields from shared nodes not supported.

issue 760
-- in.cue --
import "strings"

// TODO: this would be okay to normalize. Consider whether
// this makes sense, though.
a: {
	service: [ID=_]: name: "a"

	service: foo: shared
	service: bar: shared

	shared: name: "a"
}

b: {
	service: [ID=_]: {
		name: ID
	}
	service: foo: _shared
	_shared: {
		name: "foo" // Do not remove!
	}
}

c: {
	service: [ID=_]: {
		_service_name: *strings.TrimSuffix(ID, "-suffix") | string
	}
	service: "a-suffix": _shared
	service: "b-suffix": _shared
	_shared: {
		_service_name: "a" // Do not remove!
	}
}
-- out/trim --
== in.cue
import "strings"

// TODO: this would be okay to normalize. Consider whether
// this makes sense, though.
a: {
	service: [ID=_]: name: "a"

	service: foo: shared
	service: bar: shared

	shared: name: "a"
}

b: {
	service: [ID=_]: {
		name: ID
	}
	service: foo: _shared
	_shared: {
		name: "foo" // Do not remove!
	}
}

c: {
	service: [ID=_]: {
		_service_name: *strings.TrimSuffix(ID, "-suffix") | string
	}
	service: "a-suffix": _shared
	service: "b-suffix": _shared
	_shared: {
		_service_name: "a" // Do not remove!
	}
}
