Added testcases for pep585ga

mypy/test/testcheck.py

@@ -91,6 +91,7 @@
     'check-errorcodes.test',
     'check-annotated.test',
     'check-parameter-specification.test',
+    'check-generic-alias.test',
 ]
 
 # Tests that use Python 3.8-only AST features (like expression-scoped ignores):

mypy/typeanal.py

@@ -308,7 +308,8 @@ def try_analyze_special_unbound_type(self, t: UnboundType, fullname: str) -> Opt
         elif fullname == 'typing.Callable':
             return self.analyze_callable_type(t)
         elif (fullname == 'typing.Type' or
-             (fullname == 'builtins.type' and self.api.is_future_flag_set('annotations'))):
+             (fullname == 'builtins.type' and self.api.is_future_flag_set('annotations')) or
+             (fullname == 'builtins.type' and not self.options.python_version < (3, 9))):
             if len(t.args) == 0:
                 if fullname == 'typing.Type':
                     any_type = self.get_omitted_any(t)

test-data/unit/check-generic-alias.test

@@ -0,0 +1,49 @@
+-- Test cases for generic aliases
+
+[case testGenericAliasImportCollections]
+# flags: --python-version 3.9
+from collections import defaultdict, OrderedDict, ChainMap, Counter, deque
+
+t1: defaultdict[int, int]
+t2: OrderedDict[int, int]
+t3: ChainMap[int, int]
+t4: Counter[int]
+t5: deque[int]
+
+[builtins fixtures/tuple.pyi]
+
+[case testGenericAliasImportCollectionsABC]
+# flags: --python-version 3.9
+from collections.abc import Awaitable, Coroutine, Iterable, Iterator, Mapping
+
+t1: Awaitable
+t2: Coroutine
+t3: Iterable
+t4: Iterator
+t5: Mapping
+
+[builtins fixtures/tuple.pyi]
+
+[case testGenericAliasImportBuiltIns]
+# flags: --python-version 3.9
+
+t1: type[int]
+
+[builtins fixtures/list.pyi]
+[builtins fixtures/dict.pyi]
+
+[case testGenericAliasImportBuiltInsSet]
+# flags: --python-version 3.9
+
+t1: set[int]
+
+[builtins fixtures/set.pyi]
+
+[case testGenericAliasImportRe]
+# flags: --python-version 3.9
+from re import Pattern, Match
+
+t1: Pattern[str]
+t2: Match[str]
+
+[builtins fixtures/tuple.pyi]