Add overloads to gen.multi() (#3515)

Add overloads to gen.multi(). Closes #3514.

diff --git a/tornado/gen.py b/tornado/gen.py
index 3dab733c6a9925214889f0b29862634d31a5cd02..01e7f8a06fac209ea5f273d2246eb2cad8331969 100644 (file)
--- a/tornado/gen.py
+++ b/tornado/gen.py
@@ -437,6 +437,20 @@ class WaitIterator:
         return self.next()
 
 
+@overload
+def multi(
+    children: Sequence[_Yieldable],
+    quiet_exceptions: Union[Type[Exception], Tuple[Type[Exception], ...]] = (),
+) -> Future[List]: ...
+
+
+@overload
+def multi(
+    children: Mapping[Any, _Yieldable],
+    quiet_exceptions: Union[Type[Exception], Tuple[Type[Exception], ...]] = (),
+) -> Future[Dict]: ...
+
+
 def multi(
     children: Union[Sequence[_Yieldable], Mapping[Any, _Yieldable]],
     quiet_exceptions: "Union[Type[Exception], Tuple[Type[Exception], ...]]" = (),