Allow variables in module's source field

[iloveicedgreentea]

Current Terraform Version

Terraform v0.13.4

Use-cases

Using separate modules but all having the same variables. I can make a map variable with the key of each module name and then only have one module resource instead of one per module. I want the source field to be able to use each.key so I can programmatically generate the module source from the variable key e.g. each.key == "module1" so "./modules/${each.key}" would become ./modules/module1

Proposal

module "function" {
  for_each = var.enabled_modules
  source   = "./modules/${each.key}"

[pkolyvas]

I'm going to close this as a duplicate of #25587.

[ghost]

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