Summary

After minimizing #2597 I decided to finally sit down and write a program that could do the minimization for me, and found a different panic. I decided to open a new issue for it since the panic is different and the source code is almost completely unrecognizable + heavily abuses ty's parser, so it may or may not be fixed by a fix for #2597.

The new panic is:

error[panic]: Panicked at crates\ty_python_semantic\src\types\function.rs:299:56 when checking `C:\ty_issues\issue.py`: `AST indices should never change within the same revision`
... Omitted for brevity
info: query stacktrace:
   0: infer_scope_types_impl(Id(1000))
             at crates\ty_python_semantic\src\types\infer.rs:192
   1: check_file_impl(Id(c00))
             at crates\ty_project\src\lib.rs:554

It still requires 3 files, so a zip is attached: new_panic.zip
https://play.ty.dev/15e9a871-aeb3-4d59-8cc3-36c4a70270a7
issue.py:

from generic DataFrameGroupBy
from groupby GroupBy
class(DataFrameGroupBy)_cython_agg_general=GroupBy._cython_agg_general

generic.py:

from groupby GroupBy""class DataFrameGroupBy(GroupBy

groupby.py:

from typing final,class GroupBy(])
 @final def _cython_agg_general

Version

ty 0.0.13 (fc1478b 2026-01-21) playground f4b84a941