From f65ebfd7e715f82f5ff968b6b03464ed17c6c7e6 Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Mon, 25 Jan 2016 18:51:27 -0600
Subject: [PATCH] assignment_to_subst: complain if nothing matched
---
loopy/transform/subst.py | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/loopy/transform/subst.py b/loopy/transform/subst.py
index 6db5d396f..7623fb891 100644
--- a/loopy/transform/subst.py
+++ b/loopy/transform/subst.py
@@ -368,6 +368,10 @@ def assignment_to_subst(kernel, lhs_name, extra_arguments=(), within=None,
# }}}
+ if not definition_insn_ids:
+ raise LoopyError("no assignments to variable '%s' found"
+ % lhs_name)
+
from loopy.context_matching import parse_stack_match
within = parse_stack_match(within)
--
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