Implement wiring for Provide[foo.provider]

src/dependency_injector/providers.pyx

@@ -391,6 +391,11 @@ cdef class Delegate(Provider):
         """
         return self.__str__()
 
+    @property
+    def provides(self):
+        """Return provider."""
+        return self.__provides
+
     cpdef object _provide(self, tuple args, dict kwargs):
         """Return provided instance.
 

src/dependency_injector/wiring.py

@@ -127,6 +127,9 @@ def _resolve_injections(fn: Callable[..., Any], container: AnyContainer) -> Dict
                 config,
                 marker.provider.provides,
             )
+        elif isinstance(marker.provider, providers.Delegate):
+            provider_name = container.resolve_provider_name(marker.provider.provides)
+            provider = container.providers[provider_name]
         elif isinstance(marker.provider, providers.Provider):
             provider_name = container.resolve_provider_name(marker.provider)
             if not provider_name:

tests/unit/wiring/module.py

@@ -30,3 +30,8 @@ def test_config_value(
         some_value_decimal: Decimal = Provide[Container.config.a.b.c.as_(Decimal)],
 ):
     return some_value_int, some_value_str, some_value_decimal
+
+
+def test_provide_provider(service_provider: Callable[..., Service] = Provider[Container.service.provider]):
+    service = service_provider()
+    return service

tests/unit/wiring/test_wiring_py36.py

@@ -58,3 +58,7 @@ class WiringTest(unittest.TestCase):
         self.assertEqual(int_value, 10)
         self.assertEqual(str_value, '10')
         self.assertEqual(decimal_value, Decimal(10))
+
+    def test_provide_provider(self):
+        service = module.test_provide_provider()
+        self.assertIsInstance(service, Service)