From bc26777963b51f351e2651e41a44d3b66ce0198f Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Thu, 2 Oct 2014 18:22:32 -0700
Subject: [PATCH] config: count can't interpolate count variables

---
 config/config.go                                      | 5 +++++
 config/config_test.go                                 | 7 +++++++
 config/test-fixtures/validate-count-count-var/main.tf | 3 +++
 3 files changed, 15 insertions(+)
 create mode 100644 config/test-fixtures/validate-count-count-var/main.tf

diff --git a/config/config.go b/config/config.go
index 4d6ea1a85..b49dd685b 100644
--- a/config/config.go
+++ b/config/config.go
@@ -258,6 +258,11 @@ func (c *Config) Validate() error {
 		// Verify count variables
 		for _, v := range r.RawCount.Variables {
 			switch v.(type) {
+			case *CountVariable:
+				errs = append(errs, fmt.Errorf(
+					"%s: resource count can't reference count variable: %s",
+					n,
+					v.FullKey()))
 			case *ModuleVariable:
 				errs = append(errs, fmt.Errorf(
 					"%s: resource count can't reference module variable: %s",
diff --git a/config/config_test.go b/config/config_test.go
index 76c12d4a0..317d69edf 100644
--- a/config/config_test.go
+++ b/config/config_test.go
@@ -60,6 +60,13 @@ func TestConfigValidate_countInt(t *testing.T) {
 	}
 }
 
+func TestConfigValidate_countCountVar(t *testing.T) {
+	c := testConfig(t, "validate-count-count-var")
+	if err := c.Validate(); err == nil {
+		t.Fatal("should not be valid")
+	}
+}
+
 func TestConfigValidate_countModuleVar(t *testing.T) {
 	c := testConfig(t, "validate-count-module-var")
 	if err := c.Validate(); err == nil {
diff --git a/config/test-fixtures/validate-count-count-var/main.tf b/config/test-fixtures/validate-count-count-var/main.tf
new file mode 100644
index 000000000..f33618784
--- /dev/null
+++ b/config/test-fixtures/validate-count-count-var/main.tf
@@ -0,0 +1,3 @@
+resource "aws_instance" "web" {
+    count = "${count.index}"
+}