Carl Friedrich Bolz-Tereick <cfb...@gmx.de> added the comment:
let's see whether I promised too much, I don't know CPython's symtable.c too
well yet ;-). Will shout for help when I get stuck.
Anyway, here is a related bug, coming from the same symtable function
symtable_add_def_helper, also with an imprecise error location:
$ cat x.py
{i for i in range(5)
if (j := 0)
for j in range(5)}
$ ./python x.py
File "/home/cfbolz/projects/cpython/x.py", line 1
{i for i in range(5)
^^^^^^^^^^^^^^^^^^^^
SyntaxError: comprehension inner loop cannot rebind assignment expression
target 'j'
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46042>
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