Argument names must not be quoted, but throws an error when unquoted

[pgporada]

Terraform Version

$ terraform version
Terraform v0.12.4

Expected Behavior

I should be able to use the fixed tag ignoring functionality introduced by #21788 and this comment #21444 (comment)

Actual Behavior

resource "aws_vpc" "ct" {
  cidr_block                       = "${var.vpc_cidr_ipv4}"
  assign_generated_ipv6_cidr_block = "true"
  instance_tenancy                 = "default"
  enable_dns_support               = true
  enable_dns_hostnames             = true

  tags {
    Name       = "${var.infra_name}_${replace(var.region,"-","")}"
    TERRAFORM  = "true"
    INFRA_NAME = "${var.infra_name}"
    "kubernetes.io" = "unset"
  }

  lifecycle {
    create_before_destroy = true
    ignore_changes        = [
      tags["kubernetes.io"]
    ]
  }
}

On modules/vpc/vpc.tf line 12: Argument names must not be quoted.

Changing the resource to the following snippet where I unquote the kubernetes.io argument throws a different error.

resource "aws_vpc" "ct" {
  cidr_block                       = "${var.vpc_cidr_ipv4}"
  assign_generated_ipv6_cidr_block = "true"
  instance_tenancy                 = "default"
  enable_dns_support               = true
  enable_dns_hostnames             = true

  tags {
    Name       = "${var.infra_name}_${replace(var.region,"-","")}"
    TERRAFORM  = "true"
    INFRA_NAME = "${var.infra_name}"
    kubernetes.io = "unset"
  }

  lifecycle {
    create_before_destroy = true
    ignore_changes        = [
      tags["kubernetes.io"]
    ]
  }
}

Error: Argument or block definition required

On modules/vpc/vpc.tf line 12: An argument or block definition is required
here. To set an argument, use the equals sign "=" to introduce the argument
value.

I'm not sure how to proceed here.

Steps to Reproduce

Please list the full steps required to reproduce the issue, for example:

1. terraform init
2. terraform plan

References

• core: Fix handling of individual map keys in ignore_changes #21788
• 0.12.0 Error: Attribute name required #21444

[pgporada]

If I remove "kubernetes.io" = "unset"/kubernetes.io = "unset" from the tags block, then terraform progresses.

[pgporada]

Disregard, this was an issue during my upgrade from 0.11.14 to 0.12.4 where the tags { block should have been tags = {

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