[issue19729] str.format sublevel format parsing broken in Python 3.3.3

[HCT]

New submission from HCT:

can't find a way around it... maybe a new regression test on this.

Python 3.3.3 (v3.3.3:c3896275c0f6, Nov 18 2013, 21:18:40) [MSC v.1600 32 bit (Intel)] on win32
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>>> "0x{:0{:d}X}".format(0x0,16)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: unmatched '{' in format
>>> "0x{:0{{:d}}X}".format(0x0,16)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: Invalid format specifier
>>> "0x{:0{:d}X}".format(0x0,16)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: unmatched '{' in format
>>> "0x{:{:d}X}".format(0x0,16)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: unmatched '{' in format
>>> "0x{:0{:d}X}".format(0x0,16)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: unmatched '{' in format
>>> "0x{:0{:d}x}".format(0x0,16)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: unmatched '{' in format
>>>
>>> "{:0{}x}".format(0,16)
'0000000000000000'

"0x{:0{:d}X}".format(0x0,16) and "{:0{}x}".format(0,16)
work with Python 3.1, 3.2 and up to 3.3.2

----------
components: Interpreter Core
messages: 203954
nosy: hct
priority: normal
severity: normal
status: open
title: str.format sublevel format parsing broken in Python 3.3.3
versions: Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19729>
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