Crash when using concat on lists of maps

[oillio]

Terraform Version

Terraform v0.7.0-rc1 (301da85)

Terraform Configuration Files

Module:

variable "foo" {
  type = "list"
}
variable "bar" {
  type = "list"
}

output "outFoo" {
  value = "${concat(var.foo,var.bar)}"
}

Calling:

module "envTesting" {
  source = "../modules"
  foo {
    value     = "aVal"
  }
  foo {
    value     = "anotherVal"
  }
  bar {
    value     = "thirdVal"
  }
  bar {
    value     = "finalVal"
  }
}

Panic Output

https://gist.github.com/oillio/ad293c464de43f7ff10efe8b0ceac466

[phinze]

Hi @oillio - thanks for this report. I've reproduced and fixed up the crash with a quick solution for now in #7145, which turns it into an error message. Getting concat() to support lists of complex types is its own task that I'm spinning up into a fresh issue, which I'll link back here. 👍

[phinze]

Ok just double checked that the crasher is now fixed. Continued discussion of expected behavior can happen over in #7146

[ghost]

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