From f351de9758325809137a18207db49bdeeed0ecdc Mon Sep 17 00:00:00 2001
From: Paul Stack <public@paulstack.co.uk>
Date: Tue, 16 May 2017 17:34:16 +0300
Subject: [PATCH] provider/aws: Set aws_subnet ipv6_cidr_block to computed
 (#14542)

Fixes: #14361

An IPv6 CIDR block is option and can be added *after* a subnet has been
created. Therefore, we should set it to `Computed: true`

Otherwise, a manually created IPv6 association will be removed on the
next terraform run
---
 builtin/providers/aws/resource_aws_subnet.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/builtin/providers/aws/resource_aws_subnet.go b/builtin/providers/aws/resource_aws_subnet.go
index 2b1a0d063..a466c2ae9 100644
--- a/builtin/providers/aws/resource_aws_subnet.go
+++ b/builtin/providers/aws/resource_aws_subnet.go
@@ -41,6 +41,7 @@ func resourceAwsSubnet() *schema.Resource {
 			"ipv6_cidr_block": {
 				Type:     schema.TypeString,
 				Optional: true,
+				Computed: true,
 			},
 
 			"availability_zone": {