stubgen: Fix crash on star unpack of TypeVarTuple (#16869)

Fixes #16864

Author: hamdanal

mypy/stubgen.py

@@ -100,6 +100,7 @@
     OpExpr,
     OverloadedFuncDef,
     SetExpr,
+    StarExpr,
     Statement,
     StrExpr,
     TempNode,
@@ -339,6 +340,9 @@ def visit_ellipsis(self, node: EllipsisExpr) -> str:
     def visit_op_expr(self, o: OpExpr) -> str:
         return f"{o.left.accept(self)} {o.op} {o.right.accept(self)}"
 
+    def visit_star_expr(self, o: StarExpr) -> str:
+        return f"*{o.expr.accept(self)}"
+
 
 def find_defined_names(file: MypyFile) -> set[str]:
     finder = DefinitionFinder()

mypy/test/teststubgen.py

@@ -10,6 +10,8 @@
 from types import ModuleType
 from typing import Any
 
+import pytest
+
 from mypy.errors import CompileError
 from mypy.moduleinspect import InspectError, ModuleInspect
 from mypy.stubdoc import (
@@ -698,6 +700,8 @@ def run_case_inner(self, testcase: DataDrivenTestCase) -> None:
                 f.write(content)
 
         options = self.parse_flags(source, extra)
+        if sys.version_info < options.pyversion:
+            pytest.skip()
         modules = self.parse_modules(source)
         out_dir = "out"
         try:

test-data/unit/stubgen.test

@@ -1211,6 +1211,56 @@ T = TypeVar('T')
 
 class D(Generic[T]): ...
 
+[case testGenericClassTypeVarTuple]
+from typing import Generic
+from typing_extensions import TypeVarTuple, Unpack
+Ts = TypeVarTuple('Ts')
+class D(Generic[Unpack[Ts]]): ...
+[out]
+from typing import Generic
+from typing_extensions import TypeVarTuple, Unpack
+
+Ts = TypeVarTuple('Ts')
+
+class D(Generic[Unpack[Ts]]): ...
+
+[case testGenericClassTypeVarTuple_semanal]
+from typing import Generic
+from typing_extensions import TypeVarTuple, Unpack
+Ts = TypeVarTuple('Ts')
+class D(Generic[Unpack[Ts]]): ...
+[out]
+from typing import Generic
+from typing_extensions import TypeVarTuple, Unpack
+
+Ts = TypeVarTuple('Ts')
+
+class D(Generic[Unpack[Ts]]): ...
+
+[case testGenericClassTypeVarTuplePy311]
+# flags: --python-version=3.11
+from typing import Generic, TypeVarTuple
+Ts = TypeVarTuple('Ts')
+class D(Generic[*Ts]): ...
+[out]
+from typing import Generic, TypeVarTuple
+
+Ts = TypeVarTuple('Ts')
+
+class D(Generic[*Ts]): ...
+
+[case testGenericClassTypeVarTuplePy311_semanal]
+# flags: --python-version=3.11
+from typing import Generic, TypeVarTuple
+Ts = TypeVarTuple('Ts')
+class D(Generic[*Ts]): ...
+[out]
+from typing import Generic, TypeVarTuple
+
+Ts = TypeVarTuple('Ts')
+
+class D(Generic[*Ts]): ...
+
 [case testObjectBaseClass]
 class A(object): ...
 [out]