Clean up some mypy errors by adding real return statements

.gitignore

@@ -1,3 +1,7 @@
 __pycache__
-venv
+venv*
+.venv
 *.egg-info
+build
+dist
+*.iml

test/type_stub_test.py

@@ -18,7 +18,7 @@ def arg_no_anno(arg1):
 
 
 def scalar_args(arg1: str, arg2: int) -> float:
-    ...
+    return 0
 
 
 def generic_other_module_arg(arg: typing.List[some_mod.Foo]):
@@ -167,7 +167,7 @@ def wrapper(extra_arg: int, *args, **kwargs):
 
 class Base:
     def base_method(self) -> str:
-        ...
+        return ""
 
 
 Base.__module__ = "basemod"
@@ -176,7 +176,7 @@ def base_method(self) -> str:
 
 class Based(Base):
     def sub(self) -> float:
-        ...
+        return 0
 
 
 def test_base_class_included_and_imported():
@@ -191,7 +191,7 @@ def test_typevar():
     T.__module__ = "source_mod"
 
     def foo(arg: T) -> T:
-        ...
+        return arg
 
     src = _function_source(foo)
     assert "import source_mod" in src
@@ -228,7 +228,7 @@ def test_forward_ref():
 
 class SelfRefFoo:
     def foo(self) -> "SelfRefFoo":
-        ...
+        return self
 
 
 def test_self_ref():
@@ -241,7 +241,7 @@ def test_self_ref():
 class _Foo:
     @staticmethod
     async def clone(foo: "_Foo") -> "_Foo":
-        ...
+        return foo
 
 
 synchronizer = synchronicity.Synchronizer()
@@ -250,7 +250,7 @@ async def clone(foo: "_Foo") -> "_Foo":
 
 def test_synchronicity_type_translation():
     async def _get_foo(foo: _Foo) -> _Foo:
-        ...
+        return foo
 
     get_foo = synchronizer.create_blocking(_get_foo, "get_foo", __name__)
     src = _function_source(get_foo)
@@ -372,15 +372,15 @@ def test_translated_bound_type_vars():
 
 def test_ellipsis():
     def foo() -> typing.Callable[..., typing.Any]:
-        ...
+        return lambda x: 0
 
     src = _function_source(foo)
     assert "-> typing.Callable[..., typing.Any]" in src
 
 
 def test_typing_literal():
     def foo() -> typing.Literal["three", "str"]:
-        ...
+        return "str"
 
     src = _function_source(foo)
     assert "-> typing.Literal['three', 'str']" in src  # "str" should not be eval:ed in a Literal!