Support typing.Annotated inference

jedi/inference/gradual/typing.py

@@ -32,7 +32,7 @@ _TYPE_ALIAS_TYPES = {
     'DefaultDict': 'collections.defaultdict',
     'Deque': 'collections.deque',
 }
-_PROXY_TYPES = 'Optional Union ClassVar'.split()
+_PROXY_TYPES = 'Optional Union ClassVar Annotated'.split()
 
 
 class TypingModuleName(NameWrapper):
@@ -113,7 +113,7 @@ class ProxyWithGenerics(BaseTypingClassWithGenerics):
         elif string_name == 'Type':
             # The type is actually already given in the index_value
             return self._generics_manager[0]
-        elif string_name == 'ClassVar':
+        elif string_name in ['ClassVar', 'Annotated']:
             # For now don't do anything here, ClassVars are always used.
             return self._generics_manager[0].execute_annotation()
 

test/completion/pep0593_annotations.py

@@ -0,0 +1,26 @@
+# python >= 3.9
+
+from typing import Annotated
+
+# This is just a dummy and very meaningless thing to use with to the Annotated
+# type hint
+class Foo:
+    pass
+
+class A:
+    pass
+
+
+def annotated_function_params(
+    basic: Annotated[str, Foo()],
+    obj: A,
+    annotated_obj: Annotated[A, Foo()],
+):
+    #? str()
+    basic
+
+    #? A()
+    obj
+
+    #? A()
+    annotated_obj