From 3933b49af0f3333e12a970f7726c1f627813183a Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Sun, 5 Feb 2012 17:24:31 -0500
Subject: [PATCH] Provide a better error message for inappropriate assignment
 lhs.

---
 loopy/kernel.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/loopy/kernel.py b/loopy/kernel.py
index 66cc58e5d..8702883db 100644
--- a/loopy/kernel.py
+++ b/loopy/kernel.py
@@ -615,6 +615,11 @@ class LoopKernel(Record):
                 else:
                     temp_var_type = None
 
+                from pymbolic.primitives import Variable, Subscript
+                if not isinstance(lhs, (Variable, Subscript)):
+                    raise RuntimeError("left hand side of assignment '%s' must "
+                            "be variable or subscript" % lhs)
+
                 insns.append(
                         Instruction(
                             id=self.make_unique_instruction_id(insns, based_on=label),
-- 
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