Optional Callable is no more valid (python#1986)

yetone · Aug 5, 2016 · 2050d80 · 2050d80
1 parent e39a50d
commit 2050d80
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diff --git a/mypy/typeanal.py b/mypy/typeanal.py
@@ -19,7 +19,13 @@
 from mypy import experiments
 
 
-type_constructors = {'typing.Tuple', 'typing.Union', 'typing.Callable', 'typing.Type'}
+type_constructors = {
+    'typing.Callable',
+    'typing.Optional',
+    'typing.Tuple',
+    'typing.Type',
+    'typing.Union',
+}
 
 
 def analyze_type_alias(node: Node,

diff --git a/test-data/unit/check-optional.test b/test-data/unit/check-optional.test
@@ -311,3 +311,7 @@ def f() -> None:
 from typing import Callable
 def f() -> None: pass
 x = f  # type: Callable[[], None]
+
+[case testOptionalCallable]
+from typing import Callable, Optional
+T = Optional[Callable[..., None]]