Make tests a bit easier to work with for Zuban

Author: davidhalter

conformance/tests/generics_base_class.py

@@ -1,6 +1,6 @@
 # Specification: https://typing.readthedocs.io/en/latest/spec/generics.html#arbitrary-generic-types-as-base-classes
 
-from typing import Generic, TypeVar, Iterable, assert_type
+from typing import Generic, TypeVar, assert_type
 
 T = TypeVar("T")
 

conformance/tests/specialtypes_never.py

@@ -29,6 +29,7 @@ def func2(x: int) -> int:
     if x > 0:
         return x
     stop()
+    ...  # E?: This statement can be marked unreachable
     return "whatever works"  # No type error