Prefer to use ellipsis over pass (#2292)

stdlib/3/abc.pyi

@@ -14,6 +14,6 @@ class abstractproperty(property): ...
 def abstractstaticmethod(callable: _FuncT) -> _FuncT: ...
 def abstractclassmethod(callable: _FuncT) -> _FuncT: ...
 
-class ABC(metaclass=ABCMeta):
-    pass
+class ABC(metaclass=ABCMeta): ...
+
 def get_cache_token() -> object: ...

stdlib/3/configparser.pyi

@@ -184,12 +184,10 @@ class ConverterMapping(MutableMapping[str, Optional[_converter]]):
     def __len__(self) -> int: ...
 
 
-class Error(Exception):
-    pass
+class Error(Exception): ...
 
 
-class NoSectionError(Error):
-    pass
+class NoSectionError(Error): ...
 
 
 class DuplicateSectionError(Error):
@@ -215,16 +213,14 @@ class InterpolationError(Error):
     option = ...   # type: str
 
 
-class InterpolationDepthError(InterpolationError):
-    pass
+class InterpolationDepthError(InterpolationError): ...
 
 
 class InterpolationMissingOptionError(InterpolationError):
     reference = ...  # type: str
 
 
-class InterpolationSyntaxError(InterpolationError):
-    pass
+class InterpolationSyntaxError(InterpolationError): ...
 
 
 class ParsingError(Error):

stdlib/3/getpass.pyi

@@ -9,5 +9,4 @@ def getpass(prompt: str = ..., stream: Optional[TextIO] = ...) -> str: ...
 def getuser() -> str: ...
 
 
-class GetPassWarning(UserWarning):
-    pass
+class GetPassWarning(UserWarning): ...

stdlib/3/typing.pyi

@@ -177,8 +177,7 @@ class Coroutine(Awaitable[_V_co], Generic[_T_co, _T_contra, _V_co]):
 # NOTE: This type does not exist in typing.py or PEP 484.
 # The parameters corrrespond to Generator, but the 4th is the original type.
 class AwaitableGenerator(Awaitable[_V_co], Generator[_T_co, _T_contra, _V_co],
-                         Generic[_T_co, _T_contra, _V_co, _S], metaclass=ABCMeta):
-    pass
+                         Generic[_T_co, _T_contra, _V_co, _S], metaclass=ABCMeta): ...
 
 @runtime
 class AsyncIterable(Protocol[_T_co]):