Bug report

Bug description:

The following code produces a misleading syntax error.

lambdaname_3=f'{name_4}': {name_3}type {}[name_4]= {}

output (Python 3.12.0rc2+):

File"/home/frank/projects/pysource-codegen/bug.py",line1lambdaname_3=f'{name_4}': {name_3}^^^^^^^^^^^^^^^^^^^^^^^^^^SyntaxError:f-string:lambdaexpressionsarenotallowedwithoutparentheses

The first line should be valid python syntax and I would expect to get an syntax error for the wrong type alias name.

side note:
This is generated code. I found this issue during my work for the python 3.12 support for pysource-codegen.

CPython versions tested on:

3.12

Operating systems tested on:

Linux

Linked PRs

• gh-109114: Relax the check for invalid lambdas inside f-strings to avoid false positives #109121
• [3.12] gh-109114: Relax the check for invalid lambdas inside f-strings to avoid false positives (GH-109121). #109155