Martin Panter added the comment:
I had to recompile with “--with-pydebug” to get the crash. I know f-strings
don’t support the lambda syntax very well, but I can also make it crash without
using lambda:
>>> f"{ {1: 2}:x}"
Fatal Python error: Python/ceval.c:3576 object at 0x7fa32ab030c8 has negative
ref count -1
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: non-empty format string passed to object.__format__
Aborted (core dumped)
----------
components: +Interpreter Core
nosy: +martin.panter
type: -> crash
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26287>
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