Check arguments to django.urls.{path,re_path} functions (#464)

These functions were added in Django 2.0, but the stubs have been
incomplete since commit 9a68263257

The implementation is almost identical to `url()` from
`conf/urls/__init__.pyi`

django-stubs/urls/conf.pyi

@@ -1,8 +1,31 @@
-from typing import Any, List, Optional, Tuple
+from typing import Any, List, Optional, Tuple, overload, Callable, Dict, Union
 
-from .resolvers import URLResolver
+from .resolvers import URLResolver, URLPattern
+from ..conf.urls import IncludedURLConf
+from ..http.response import HttpResponseBase
 
 def include(arg: Any, namespace: Optional[str] = ...) -> Tuple[List[URLResolver], Optional[str], Optional[str]]: ...
 
-path: Any
-re_path: Any
+# path()
+@overload
+def path(
+    route: str, view: Callable[..., HttpResponseBase], kwargs: Dict[str, Any] = ..., name: str = ...
+) -> URLPattern: ...
+@overload
+def path(route: str, view: IncludedURLConf, kwargs: Dict[str, Any] = ..., name: str = ...) -> URLResolver: ...
+@overload
+def path(
+    route: str, view: List[Union[URLResolver, str]], kwargs: Dict[str, Any] = ..., name: str = ...
+) -> URLResolver: ...
+
+# re_path()
+@overload
+def re_path(
+    route: str, view: Callable[..., HttpResponseBase], kwargs: Dict[str, Any] = ..., name: str = ...
+) -> URLPattern: ...
+@overload
+def re_path(route: str, view: IncludedURLConf, kwargs: Dict[str, Any] = ..., name: str = ...) -> URLResolver: ...
+@overload
+def re_path(
+    route: str, view: List[Union[URLResolver, str]], kwargs: Dict[str, Any] = ..., name: str = ...
+) -> URLResolver: ...

scripts/enabled_test_modules.py

@@ -451,9 +451,11 @@ IGNORED_ERRORS = {
     'urlpatterns': [
         '"object" not callable',
         '"None" not callable',
+        'Argument 2 to "path" has incompatible type "Callable[[Any], None]"',
+        'Incompatible return value type (got "None", expected "HttpResponseBase")',
     ],
     'urlpatterns_reverse': [
-        'List or tuple expected as variable arguments',
+        'No overload variant of "path" matches argument types "str", "None"',
         'No overload variant of "zip" matches argument types "Any", "object"',
         'Argument 1 to "get_callable" has incompatible type "int"'
     ],