Bug report

Bug description:

The following code causes a crash with cpython 3.13 (56a7e04) and with the current main branch (d68a22e)

asyncdefname_4():matchb'':caseTrue:passcasename_5iff'e':            {name_3:name_4asyncforname_2inname_5}case []:pass    [[]]

output (Python 3.13.0b2+):

python:Python/flowgraph.c:2282:push_cold_blocks_to_end:Assertion `prev_instr'failed.

I bisected the problem down to this commit2091fb2.
@iritkatriel can you take a look at it?

CPython versions tested on:

3.13, CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-120225: fix crash in compiler on empty block at end of exception handler #120235
• [3.13] gh-120225: fix crash in compiler on empty block at end of exception handler (GH-120235) #120249