From 676747adc5278400790b5bb0f198e52858c72b44 Mon Sep 17 00:00:00 2001
From: Andrew Stone <a@stoney.io>
Date: Tue, 31 May 2016 23:32:30 -0400
Subject: [PATCH] Fix 'index out of range' error

---
 param_test.go | 4 ++++
 parse.go      | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/param_test.go b/param_test.go
index 48f5e42..7ee81d3 100644
--- a/param_test.go
+++ b/param_test.go
@@ -472,6 +472,10 @@ func TestStructErrors(t *testing.T) {
 		t.Error("expected error parsing struct without key")
 	}
 
+	if _, ok := err.(SyntaxError); !ok {
+		t.Error("expected SyntaxError parsing struct without key")
+	}
+
 	err = Parse(url.Values{"Struct[": {"llama"}}, &e)
 	if err == nil {
 		t.Error("expected error parsing malformed struct key")
diff --git a/parse.go b/parse.go
index b8c069d..6386da7 100644
--- a/parse.go
+++ b/parse.go
@@ -77,7 +77,7 @@ func primitive(key, keytail string, tipe reflect.Type, values []string) {
 }
 
 func keyed(tipe reflect.Type, key, keytail string) (string, string) {
-	if keytail[0] != '[' {
+	if keytail == "" || keytail[0] != '[' {
 		panic(SyntaxError{
 			Key:       kpath(key, keytail),
 			Subtype:   MissingOpeningBracket,