github.com/ben-turner/terraform@v0.11.8-0.20180503104400-0cc9e050ecd4/terraform/test-fixtures/transform-flat-config-basic/main.tf

resource "aws_instance" "foo" {}
resource "aws_instance" "bar" { value = "${aws_instance.foo.value}" }

module "child" {
    source = "./child"
}