From 0f88fa1b39a5ae21551738d90be97fe94340f3d3 Mon Sep 17 00:00:00 2001
From: Shantanu Jain <hauntsaninja@gmail.com>
Date: Sat, 28 Dec 2024 02:46:25 -0800
Subject: [PATCH] Fix crash from NamedTuple placeholder

Fixes https://github.com/python/mypy/issues/17396

I'm having trouble writing a regression test, but the following
reproduces the issue nicely:
```
rm -rf repro
mkdir repro
mkdir repro/np
echo 'from .arraysetops import UniqueAllResult' > repro/np/__init__.pyi
echo '
from typing import Generic, NamedTuple, TypeVar
from np import does_not_exist

_SCT = TypeVar("_SCT", bound=does_not_exist)

class UniqueAllResult(NamedTuple, Generic[_SCT]):
    values: int
' > repro/np/arraysetops.pyi
touch repro/np/py.typed

PYTHONPATH=repro mypy -c 'import np'
```
---
 mypy/semanal.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mypy/semanal.py b/mypy/semanal.py
index 6e3335aed4e1..ebe6a9312b96 100644
--- a/mypy/semanal.py
+++ b/mypy/semanal.py
@@ -2090,7 +2090,7 @@ def analyze_namedtuple_classdef(
                 defn, self.is_stub_file, self.is_func_scope()
             )
         if is_named_tuple:
-            if info is None:
+            if info is None or any(has_placeholder(tv) for tv in tvar_defs):
                 self.mark_incomplete(defn.name, defn)
             else:
                 self.prepare_class_def(defn, info, custom_names=True)