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Issue #9011: Remove buggy and unnecessary ST->AST compilation code

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dealing with unary minus applied to a constant.  The removed code was
mutating the ST, causing a second compilation to fail.  (The peephole
optimizer already takes care of optimizing this case, so there's no
lost optimization opportunity here.)
This commit is contained in:
Mark Dickinson 2010-06-17 12:33:22 +00:00
parent a1b3740d04
commit d35a32e12e
3 changed files with 16 additions and 27 deletions
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12
Lib/test/test_parser.py
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@ -484,8 +484,18 @@ class CompileTestCase(unittest.TestCase):
st = parser.suite('a = "\\u1"')
self.assertRaises(SyntaxError, parser.compilest, st)
def test_issue_9011(self):
# Issue 9011: compilation of an unary minus expression changed
# the meaning of the ST, so that a second compilation produced
# incorrect results.
st = parser.expr('-3')
code1 = parser.compilest(st)
self.assertEqual(eval(code1), -3)
code2 = parser.compilest(st)
self.assertEqual(eval(code2), -3)
class ParserStackLimitTestCase(unittest.TestCase):
"""try to push the parser to/over it's limits.
"""try to push the parser to/over its limits.
see http://bugs.python.org/issue1881 for a discussion
"""
def _nested_expression(self, level):