From 6781b3cdf65a26b61f14d15c0cbc3db09d628c44 Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Wed, 29 May 2013 08:13:44 -0400
Subject: [PATCH] Fix corner case in _infer_var_type.

---
 loopy/preprocess.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/loopy/preprocess.py b/loopy/preprocess.py
index 583dd9116..6800a10c6 100644
--- a/loopy/preprocess.py
+++ b/loopy/preprocess.py
@@ -43,7 +43,7 @@ def _infer_var_type(kernel, var_name, type_inf_mapper, subst_expander):
     dtypes = []
 
     from loopy.codegen.expression import DependencyTypeInferenceFailure
-    for writer_insn_id in kernel.writer_map()[var_name]:
+    for writer_insn_id in kernel.writer_map().get(var_name, []):
         expr = subst_expander(
                 kernel.id_to_insn[writer_insn_id].expression,
                 insn_id=writer_insn_id)
-- 
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