Can't reference module output in aws_iam_user count

[phoolish]

module "vars" {
  source = "../variables"
}

resource "aws_iam_user" "mod" {
  count = "${length(split(",", module.vars.members))}"
  name = "${element(split(",", module.vars.members), count.index)}"
}

Returns:

Errors:

  * 1 error(s) occurred:

* module members.root: 1 error(s) occurred:

* aws_iam_user.mod: resource count can't reference module variable: module.vars.members

If I set the count or use a local variable, it works without a problem.

Terraform v0.6.6

Thanks!

[phoolish]

Duplicates #1497

[ghost]

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