From 736fda16136c42da5217e27c3807f4ff3c907173 Mon Sep 17 00:00:00 2001
From: Radek Simko <radek.simko@gmail.com>
Date: Thu, 18 Jul 2019 15:01:00 +0100
Subject: [PATCH] lang/funcs: Pass through empty list in chunklist

---
 lang/funcs/collection.go      | 4 ++++
 lang/funcs/collection_test.go | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/lang/funcs/collection.go b/lang/funcs/collection.go
index fd0de9ea5f61..5f28867a04f8 100644
--- a/lang/funcs/collection.go
+++ b/lang/funcs/collection.go
@@ -392,6 +392,10 @@ var ChunklistFunc = function.New(&function.Spec{
 			return cty.UnknownVal(retType), nil
 		}
 
+		if listVal.LengthInt() == 0 {
+			return cty.ListValEmpty(listVal.Type()), nil
+		}
+
 		var size int
 		err = gocty.FromCtyValue(args[1], &size)
 		if err != nil {
diff --git a/lang/funcs/collection_test.go b/lang/funcs/collection_test.go
index ba79ee33b3a9..334a98e7a812 100644
--- a/lang/funcs/collection_test.go
+++ b/lang/funcs/collection_test.go
@@ -1087,6 +1087,12 @@ func TestChunklist(t *testing.T) {
 			cty.UnknownVal(cty.List(cty.List(cty.String))),
 			false,
 		},
+		{
+			cty.ListValEmpty(cty.String),
+			cty.NumberIntVal(3),
+			cty.ListValEmpty(cty.List(cty.String)),
+			false,
+		},
 	}
 
 	for i, test := range tests {