From 7fb4c4acad9ee037b45e836c90f5d199e49e38a5 Mon Sep 17 00:00:00 2001
From: Matt Brown <github@muglug.com>
Date: Thu, 14 Jun 2018 15:58:49 -0400
Subject: [PATCH] Allow 0 in type

---
 src/Psalm/Type.php | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/src/Psalm/Type.php b/src/Psalm/Type.php
index 35eb47530..3fa7fe3a5 100644
--- a/src/Psalm/Type.php
+++ b/src/Psalm/Type.php
@@ -594,6 +594,7 @@ abstract class Type
 
             if ($string_type_token[0] === '"'
                 || $string_type_token[0] === '\''
+                || $string_type_token === '0'
                 || preg_match('/[1-9]/', $string_type_token[0])
             ) {
                 continue;
@@ -653,10 +654,6 @@ abstract class Type
             throw new \InvalidArgumentException('$class cannot be empty');
         }
 
-        if ($class === '0') {
-            throw new TypeParseTreeException('Unrecognised class 0');
-        }
-
         if ($class[0] === '\\') {
             return substr($class, 1);
         }