Merge pull request #20 from oremanj/exitfixes

Mark context manager exits that can't swallow exceptions as returning None

Author: njsmith

trio-stubs/__init__.pyi

@@ -204,7 +204,7 @@ class CapacityLimiter:
     def release_on_behalf_of(self, borrower: object) -> None: ...
     def statistics(self) -> _Statistics: ...
     async def __aenter__(self) -> None: ...
-    async def __aexit__(self, *exc: object) -> bool: ...
+    async def __aexit__(self, *exc: object) -> None: ...
 
 class Semaphore:
     value: int
@@ -215,7 +215,7 @@ class Semaphore:
     def release(self) -> None: ...
     def statistics(self) -> _Statistics: ...
     async def __aenter__(self) -> None: ...
-    async def __aexit__(self, *exc: object) -> bool: ...
+    async def __aexit__(self, *exc: object) -> None: ...
 
 class Lock:
     def locked(self) -> bool: ...
@@ -224,7 +224,7 @@ class Lock:
     def release(self) -> None: ...
     def statistics(self) -> _Statistics: ...
     async def __aenter__(self) -> None: ...
-    async def __aexit__(self, *exc: object) -> bool: ...
+    async def __aexit__(self, *exc: object) -> None: ...
 
 class StrictFIFOLock(Lock):
     pass
@@ -240,7 +240,7 @@ class Condition:
     def notify_all(self) -> None: ...
     def statistics(self) -> _Statistics: ...
     async def __aenter__(self) -> None: ...
-    async def __aexit__(self, *exc: object) -> bool: ...
+    async def __aexit__(self, *exc: object) -> None: ...
 
 # _highlevel_generic
 async def aclose_forcefully(resource: trio.abc.AsyncResource) -> None: ...

trio-stubs/abc.pyi

@@ -52,7 +52,7 @@ class AsyncResource(metaclass=ABCMeta):
     @abstractmethod
     async def aclose(self) -> None: ...
     async def __aenter__(self: T) -> T: ...
-    async def __aexit__(self, *exc: object) -> bool: ...
+    async def __aexit__(self, *exc: object) -> None: ...
 
 class SendStream(AsyncResource):
     @abstractmethod