Try to fix mypyc issues

Author: chadrik

mypy/stubutil.py

@@ -11,6 +11,8 @@
 from typing import Iterable, Iterator, Mapping
 from typing_extensions import Final, overload
 
+from mypy_extensions import mypyc_attr
+
 import mypy.options
 from mypy.modulefinder import ModuleNotFoundReason
 from mypy.moduleinspect import InspectError, ModuleInspect
@@ -326,6 +328,7 @@ def infer_method_ret_type(name: str) -> str | None:
     return None
 
 
+@mypyc_attr(allow_interpreted_subclasses=True)
 class SignatureGenerator:
     """Abstract base class for extracting a list of FunctionSigs for each function."""
 
@@ -479,6 +482,7 @@ def import_lines(self) -> list[str]:
         return result
 
 
+@mypyc_attr(allow_interpreted_subclasses=True)
 class BaseStubGenerator:
     # These names should be omitted from generated stubs.
     IGNORED_DUNDERS: Final = {

mypy/traverser.py

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from mypy_extensions import mypyc_attr
+from mypy_extensions import mypyc_attr, trait
 
 from mypy.nodes import (
     REVEAL_TYPE,
@@ -94,6 +94,7 @@
 from mypy.visitor import NodeVisitor
 
 
+@trait
 @mypyc_attr(allow_interpreted_subclasses=True)
 class TraverserVisitor(NodeVisitor[None]):
     """A parse tree visitor that traverses the parse tree during visiting.

setup.py

@@ -110,10 +110,8 @@ def run(self):
             "version.py",
             # Skip these to reduce the size of the build
             "stubtest.py",
-            "stubgen.py",
             "stubgenc.py",
             "stubdoc.py",
-            "stubutil.py",
         )
     ) + (
         # Don't want to grab this accidentally