[BUG] tm_hcl_expression() no longer able to be used in lets{} block in 0.17.0

[benscholler-ciq]

Describe the bug
After updating to version 0.17.0, tm_hcl_expression() is undefined when used within a lets() block.

lets eval: let.providers: eval expression: There is no function named "tm_hcl_expression"

To Reproduce

Steps to reproduce the behavior:
1.

generate_hcl "_tm_gen_providers.tf" {

lets {
    providers = {
      aws = {
        source  = "hashicorp/aws"
        version = "~> 5.0"
        config = {
          default_tags = tm_hcl_expression("local.common_tags")
        }
      }
    }
}

2. Run terramate generate
3. See error

Expected behavior
tm_hcl_expression was able to be used before the version change. Is this a regression or expected behavior moving forward?

Environment (please complete the following information):

• OS: MacOS
• OS Version: 26.5
• Git Version: 2.50.1
• Terramate Version: 0.17.0

Additional context
Add any other context about the problem here.

[snakster]

Which version did you use before?

You are correct that the function is only supported in the content block, but from what I can tell, this has always been the case and is by design. I tested back until v0.10.0, it was the same behaviour already.

[benscholler-ciq]

Which version did you use before?

You are correct that the function is only supported in the content block, but from what I can tell, this has always been the case and is by design. I tested back until v0.10.0, it was the same behaviour already.

We were using v0.16