No way to escape ${ in terragrunt configuration file

[andresvia]

Assuming terraform.tfvars is the Terragrunt configuration file, I was not able to find any way to pass variables values containing ${ (the expected escape sequence $${ doesn't work). In the repro bellow my last resort was to octal escape the dollar sign:

Terraform code (main.tf)

variable "var1" {}
resource "random_pet" "pet" {
  prefix = "${data.template_file.a_template.rendered}-"
}
data "template_file" "a_template" {
  template = "${var.var1}"
  vars {
    text = "replacement"
  }
}

Terragrunt configuration (terraform.tfvars)

terragrunt {
  terraform {
    source = "./"
  }
}
var1 = "\044{text}" // "${text}" fails with [terragrunt] 2018/09/12 00:12:09 Invalid interpolation syntax. Expected syntax of the form '${function_name()}', but got '${text}'

Maybe related to: #466

[brikis98]

Duplicate of #544. Terragrunt uses an ugly regex to process interpolations and escapes and comments don't work properly Will hopefully be fixed when we update to to HCL2 in #466.