From 28ad4e6d83e307b814d76f53795fa5ff61bbdb2f Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Thu, 7 Apr 2016 15:09:55 -0700
Subject: fix segfault in generic functions

See #22
---
 src/parser.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/parser.cpp b/src/parser.cpp
index df1fe65310..2c3c4e4155 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -2861,8 +2861,12 @@ static void clone_subtree_list_ptr(ZigList<AstNode *> **dest_ptr, ZigList<AstNod
 }
 
 static void clone_subtree_field(AstNode **dest, AstNode *src, uint32_t *next_node_index) {
-    *dest = ast_clone_subtree(src, next_node_index);
-    (*dest)->parent_field = dest;
+    if (src) {
+        *dest = ast_clone_subtree(src, next_node_index);
+        (*dest)->parent_field = dest;
+    } else {
+        *dest = nullptr;
+    }
 }
 
 static void clone_subtree_tld(TopLevelDecl *dest, TopLevelDecl *src, uint32_t *next_node_index) {
-- 
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