v1.5.7/internal/terraform/testdata/transform-trans-reduce-basic/main.tf

resource "aws_instance" "A" {}

resource "aws_instance" "B" {
    A = "${aws_instance.A.id}"
}

resource "aws_instance" "C" {
    A = "${aws_instance.A.id}"
    B = "${aws_instance.B.id}"
}