Recursive loop expanding variables in included module

[MrMickS]

When testing a module call which passes through the following input:

  filename = "${path.module}/${var.filename}"

It triggers an infinite loop when var.filename is used in a templatefile call inside the module.

The attached zip file contains a simple example to demonstrate the issue. recursive_loop_error.zip

Running Terrascan in debug mode on this gives the following when the infinite loop starts:

2021-04-16T14:29:30.379Z	debug	commons/resource.go:62	created resource config for resource 'example', file: '/src/recursive_loop_error/dummy/main.tf'
2021-04-16T14:29:30.379Z	debug	commons/variable-references.go:109	resolving variable ref "${templatefile(\n    var.filename,\n    {\n      foo = \"bar\"\n    }\n  )}" in parent module call
2021-04-16T14:29:30.379Z	debug	commons/variable-references.go:57	extracted variable name "filename" from reference "${templatefile(\n    var.filename,\n    {\n      foo = \"bar\"\n    }\n  )}"
2021-04-16T14:29:30.382Z	debug	commons/variable-references.go:155	resolved str variable ref: '${templatefile(
    var.filename,
    {
      foo = "bar"
    }
  )}', value: '${templatefile(
    ${path.module}/${var.filename},
    {
      foo = "bar"
    }
  )}'
2021-04-16T14:29:30.382Z	debug	commons/variable-references.go:109	resolving variable ref "${templatefile(\n    ${path.module}/${var.filename},\n    {\n      foo = \"bar\"\n    }\n  )}" in parent module call
2021-04-16T14:29:30.382Z	debug	commons/variable-references.go:57	extracted variable name "filename" from reference "${templatefile(\n    ${path.module}/${var.filename},\n    {\n      foo = \"bar\"\n    }\n  )}"
2021-04-16T14:29:30.386Z	debug	commons/variable-references.go:155	resolved str variable ref: '${templatefile(
    ${path.module}/${var.filename},
    {
      foo = "bar"
    }
  )}', value: '${templatefile(
    ${path.module}/${path.module}/${var.filename},
    {
      foo = "bar"
    }
  )}'
2021-04-16T14:29:30.387Z	debug	commons/variable-references.go:109	resolving variable ref "${templatefile(\n    ${path.module}/${path.module}/${var.filename},\n    {\n      foo = \"bar\"\n    }\n  )}" in parent module call
2021-04-16T14:29:30.388Z	debug	commons/variable-references.go:57	extracted variable name "filename" from reference "${templatefile(\n    ${path.module}/${path.module}/${var.filename},\n    {\n      foo = \"bar\"\n    }\n  )}"
2021-04-16T14:29:30.389Z	debug	commons/variable-references.go:155	resolved str variable ref: '${templatefile(
    ${path.module}/${path.module}/${var.filename},
    {
      foo = "bar"
    }
  )}', value: '${templatefile(
    ${path.module}/${path.module}/${path.module}/${var.filename},
    {
      foo = "bar"
    }
  )}'

If you need any more information please contact me.

Edited to sort out link to Zip file.