[Bug python/29245] [gdb/testsuite, python2] FAIL: gdb.python/py-mi-cmd.exp: -pycmd bk3 (unexpected output)

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29245

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Using a standalone reproducer:
...
$ cat test.py
class BadKey:
    def __repr__(self):
        return "Bad Key"


class ReallyBadKey:
    def __repr__(self):
        return BadKey()

a = {"result": {ReallyBadKey(): "world"}}

print (a)
...
we can see the behaviour with python3:
...
$ python3 test.py
Traceback (most recent call last):
  File "test.py", line 12, in <module>
    print (a)
TypeError: __repr__ returned non-string (type BadKey)
...
and python2:
...
$ python2 test.py
{'result': {Traceback (most recent call last):
  File "test.py", line 12, in <module>
    print (a)
TypeError: __repr__ returned non-string (type instance)
...

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