v1.4.7/internal/terraform/testdata/issue-5254/step-0/main.tf

variable "c" {
  default = 1
}

resource "template_file" "parent" {
  count    = var.c
  template = "Hi"
}

resource "template_file" "child" {
  template = "${join(",", template_file.parent.*.template)} ok"
}