From 0661e91feda0757c10c8b3bf3fa047b7d3e50444 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Tue, 15 Mar 2011 15:03:36 -0700
Subject: Issue 11510: Fix BUILD_SET optimizer bug.

---
 Python/peephole.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'Python/peephole.c')

diff --git a/Python/peephole.c b/Python/peephole.c
index ab96ce9def..4bc65dcc31 100644
--- a/Python/peephole.c
+++ b/Python/peephole.c
@@ -535,7 +535,8 @@ PyCode_Optimize(PyObject *code, PyObject* consts, PyObject *names,
                 }
                 if (codestr[i+3] != UNPACK_SEQUENCE  ||
                     !ISBASICBLOCK(blocks,i,6) ||
-                    j != GETARG(codestr, i+3))
+                    j != GETARG(codestr, i+3) ||
+                    opcode == BUILD_SET)
                     continue;
                 if (j == 1) {
                     memset(codestr+i, NOP, 6);
-- 
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