1 files changed, 12 insertions, 9 deletions

diff --git a/vendor/github.com/hashicorp/terraform/helper/shadow/closer.go b/vendor/github.com/hashicorp/terraform/helper/shadow/closer.go
index 7edd5e7..edc1e2a 100644
--- a/vendor/github.com/hashicorp/terraform/helper/shadow/closer.go
+++ b/vendor/github.com/hashicorp/terraform/helper/shadow/closer.go
@@ -39,6 +39,8 @@ func (w *closeWalker) Struct(reflect.Value) error {
         return nil
 }
 
+var closerType = reflect.TypeOf((*io.Closer)(nil)).Elem()
+
 func (w *closeWalker) StructField(f reflect.StructField, v reflect.Value) error {
         // Not sure why this would be but lets avoid some panics
         if !v.IsValid() {
@@ -56,17 +58,18 @@ func (w *closeWalker) StructField(f reflect.StructField, v reflect.Value) error
                 return nil
         }
 
-        // We're looking for an io.Closer
-        raw := v.Interface()
-        if raw == nil {
-                return nil
+        var closer io.Closer
+        if v.Type().Implements(closerType) {
+                closer = v.Interface().(io.Closer)
+        } else if v.CanAddr() {
+                // The Close method may require a pointer receiver, but we only have a value.
+                v := v.Addr()
+                if v.Type().Implements(closerType) {
+                        closer = v.Interface().(io.Closer)
+                }
         }
 
-        closer, ok := raw.(io.Closer)
-        if !ok && v.CanAddr() {
-                closer, ok = v.Addr().Interface().(io.Closer)
-        }
-        if !ok {
+        if closer == nil {
                 return reflectwalk.SkipEntry
         }