invalid error while creating vpc

[dattatrayakumbhar]

Terraform Version

Terraform v0.9.6

Terraform Configuration Files

[root@dathost terraform1]# main.tf
resource "aws_vpc" "mod" {
cidr_block = "20.0.0.0/16"
tags = "${merge(var.tags, map("Name", format("%s", var.name)))}"
}

[root@dathost terraform1]# variable.tf
variable "name" {}
variable "tags" {
description = "A map of tags to add to all resources"
default = {}
}

[root@dathost terraform1]# output.tf
output "vpc_id" {
value = "${aws_vpc.mod.id}"
}

1. First terraform apply gave cidr as 0.0.0.0/0 which said 0.0.0.0/0 cidr is invalid which is expected.
   [root@dathost terraform1]# terraform apply
   var.name
   Enter a value: datta

aws_vpc.mod: Creating...
assign_generated_ipv6_cidr_block: "" => "false"
cidr_block: "" => "0.0.0.0/0"
default_network_acl_id: "" => ""
default_route_table_id: "" => ""
default_security_group_id: "" => ""
dhcp_options_id: "" => ""
enable_classiclink: "" => ""
enable_dns_hostnames: "" => ""
enable_dns_support: "" => "true"
instance_tenancy: "" => ""
ipv6_association_id: "" => ""
ipv6_cidr_block: "" => ""
main_route_table_id: "" => ""
tags.%: "" => "1"
tags.Name: "" => "datta"
Error applying plan:

1 error(s) occurred:

• aws_vpc.mod: 1 error(s) occurred:

• aws_vpc.mod: Error creating VPC: InvalidVpc.Range: The CIDR '0.0.0.0/0' is invalid.
  status code: 400, request id: 8f2f8642-14bc-4071-96b1-04a19d6a4634

2. Second time cidr was 20.0.0.0/0 which also invalid only but error which we got is expected cidr is "0.0.0.0/0" which is also not valid as per config: bundle metadata requires global constraints #1.

[root@dathost terraform1]# terraform plan
var.name
Enter a value: datta

1 error(s) occurred:

• aws_vpc.mod: "cidr_block" must contain a valid network CIDR, expected "0.0.0.0/0", got "20.0.0.0/0"

Expected Behavior

Expected error in #2 would be like * aws_vpc.mod: "cidr_block" must contain a valid network CIDR, expected "x.0.0.0/y", got "20.0.0.0/0"
Or instead of x.0.0.0/y we could provide any valid cidr like "10.0.0.0/8" or "10.0.0.0/16"
If 0.0.0.0/0 is invalid , why shold we show it in warning.

Actual Behavior

• aws_vpc.mod: "cidr_block" must contain a valid network CIDR, expected "0.0.0.0/0", got "20.0.0.0/0"

Steps to Reproduce

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

1. terraform plan when cidr is "0.0.0.0/0"
2. terraform plan when cidr is "20.0.0.0/0"

[ghost]

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