From e01a37d9766e0985a60669e162411cf708f6f60f Mon Sep 17 00:00:00 2001
From: "James J. Goodhouse" <j.goodhouse@gmail.com>
Date: Tue, 19 Nov 2019 15:39:04 -0800
Subject: [PATCH] remove setdifference as it is not implemented correct in
 underlying lib

https://github.com/zclconf/go-cty/issues/27
---
 lang/functions.go                             |  1 -
 lang/functions_test.go                        | 11 -----
 .../functions/setdifference.html.md           | 41 -------------------
 website/layouts/functions.erb                 |  4 --
 4 files changed, 57 deletions(-)
 delete mode 100644 website/docs/configuration/functions/setdifference.html.md

diff --git a/lang/functions.go b/lang/functions.go
index 6964ad2ab291..1996d0d36e10 100644
--- a/lang/functions.go
+++ b/lang/functions.go
@@ -96,7 +96,6 @@ func (s *Scope) Functions() map[string]function.Function {
 			"replace":          funcs.ReplaceFunc,
 			"reverse":          funcs.ReverseFunc,
 			"rsadecrypt":       funcs.RsaDecryptFunc,
-			"setdifference":    stdlib.SetSymmetricDifferenceFunc,
 			"setintersection":  stdlib.SetIntersectionFunc,
 			"setproduct":       funcs.SetProductFunc,
 			"setsubtract":      stdlib.SetSubtractFunc,
diff --git a/lang/functions_test.go b/lang/functions_test.go
index 9e317a05c467..ce5febafbc88 100644
--- a/lang/functions_test.go
+++ b/lang/functions_test.go
@@ -643,17 +643,6 @@ func TestFunctions(t *testing.T) {
 			},
 		},
 
-		"setdifference": {
-			{
-				`setdifference(["a", "b"], ["a", "c"], ["a", "d"])`,
-				cty.SetVal([]cty.Value{
-					cty.StringVal("b"),
-					cty.StringVal("c"),
-					cty.StringVal("d"),
-				}),
-			},
-		},
-
 		"setintersection": {
 			{
 				`setintersection(["a", "b"], ["b", "c"], ["b", "d"])`,
diff --git a/website/docs/configuration/functions/setdifference.html.md b/website/docs/configuration/functions/setdifference.html.md
deleted file mode 100644
index 985ddd2c5f63..000000000000
--- a/website/docs/configuration/functions/setdifference.html.md
+++ /dev/null
@@ -1,41 +0,0 @@
----
-layout: "functions"
-page_title: "setdifference - Functions - Configuration Language"
-sidebar_current: "docs-funcs-collection-setsubtract"
-description: |-
-  The setdifference function returns a new set containing elements
-  that appear in any of the given sets but not multiple
----
-
-# `setdifference` Function
-
--> **Note:** This page is about Terraform 0.12 and later. For Terraform 0.11 and
-earlier, see
-[0.11 Configuration Language: Interpolation Syntax](../../configuration-0-11/interpolation.html).
-
-The `setdifference` function returns a new set containing elements that appear in any of the given sets but not multiple. In other words, it computes the
-[symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference) of the sets.
-
-```hcl
-setdifference(a, b, c)
-```
-
-## Examples
-
-```
-> setdifference(["a", "b"], ["a", "c"], ["a", "d"])
-[
-  "b",
-  "c",
-  "d",
-]
-```
-
-## Related Functions
-
-* [`setintersection`](./setintersection.html) computes the _intersection_ of multiple sets
-* [`setproduct`](./setproduct.html) computes the _Cartesian product_ of multiple
-  sets.
-* [`setsubtract`](./setdifference.html) computes the _relative complement_ of two sets
-* [`setunion`](./setunion.html) computes the _union_ of
-  multiple sets.
diff --git a/website/layouts/functions.erb b/website/layouts/functions.erb
index e1aa33ace331..c5378a7ff804 100644
--- a/website/layouts/functions.erb
+++ b/website/layouts/functions.erb
@@ -214,10 +214,6 @@
                 <a href="/docs/configuration/functions/reverse.html">reverse</a>
               </li>
 
-              <li>
-                <a href="/docs/configuration/functions/setdifference.html">setdifference</a>
-              </li>
-
               <li>
                 <a href="/docs/configuration/functions/setintersection.html">setintersection</a>
               </li>