Mark some types as non-hashable (#3219)

Based on @JelleZijlstra's PR #2221.

Fixes #2148

stdlib/2/__builtin__.pyi

@@ -734,7 +734,7 @@ class bytearray(MutableSequence[int], ByteString):
     def __repr__(self) -> str: ...
     def __int__(self) -> int: ...
     def __float__(self) -> float: ...
-    def __hash__(self) -> int: ...
+    __hash__: None  # type: ignore
     @overload
     def __getitem__(self, i: int) -> int: ...
     @overload
@@ -849,6 +849,7 @@ class slice(object):
     def __init__(self, stop: Any) -> None: ...
     @overload
     def __init__(self, start: Any, stop: Any, step: Any = ...) -> None: ...
+    __hash__: None  # type: ignore
     def indices(self, len: int) -> Tuple[int, int, int]: ...
 
 class tuple(Sequence[_T_co], Generic[_T_co]):
@@ -906,7 +907,7 @@ class list(MutableSequence[_T], Generic[_T]):
     def __len__(self) -> int: ...
     def __iter__(self) -> Iterator[_T]: ...
     def __str__(self) -> str: ...
-    def __hash__(self) -> int: ...
+    __hash__: None  # type: ignore
     @overload
     def __getitem__(self, i: int) -> _T: ...
     @overload
@@ -980,6 +981,7 @@ class dict(MutableMapping[_KT, _VT], Generic[_KT, _VT]):
     def __delitem__(self, v: _KT) -> None: ...
     def __iter__(self) -> Iterator[_KT]: ...
     def __str__(self) -> str: ...
+    __hash__: None  # type: ignore
 
 class set(MutableSet[_T], Generic[_T]):
     def __init__(self, iterable: Iterable[_T] = ...) -> None: ...
@@ -1016,6 +1018,7 @@ class set(MutableSet[_T], Generic[_T]):
     def __lt__(self, s: AbstractSet[object]) -> bool: ...
     def __ge__(self, s: AbstractSet[object]) -> bool: ...
     def __gt__(self, s: AbstractSet[object]) -> bool: ...
+    __hash__: None  # type: ignore
 
 class frozenset(AbstractSet[_T], Generic[_T]):
     def __init__(self, iterable: Iterable[_T] = ...) -> None: ...

stdlib/2and3/builtins.pyi

@@ -734,7 +734,7 @@ class bytearray(MutableSequence[int], ByteString):
     def __repr__(self) -> str: ...
     def __int__(self) -> int: ...
     def __float__(self) -> float: ...
-    def __hash__(self) -> int: ...
+    __hash__: None  # type: ignore
     @overload
     def __getitem__(self, i: int) -> int: ...
     @overload
@@ -849,6 +849,7 @@ class slice(object):
     def __init__(self, stop: Any) -> None: ...
     @overload
     def __init__(self, start: Any, stop: Any, step: Any = ...) -> None: ...
+    __hash__: None  # type: ignore
     def indices(self, len: int) -> Tuple[int, int, int]: ...
 
 class tuple(Sequence[_T_co], Generic[_T_co]):
@@ -906,7 +907,7 @@ class list(MutableSequence[_T], Generic[_T]):
     def __len__(self) -> int: ...
     def __iter__(self) -> Iterator[_T]: ...
     def __str__(self) -> str: ...
-    def __hash__(self) -> int: ...
+    __hash__: None  # type: ignore
     @overload
     def __getitem__(self, i: int) -> _T: ...
     @overload
@@ -980,6 +981,7 @@ class dict(MutableMapping[_KT, _VT], Generic[_KT, _VT]):
     def __delitem__(self, v: _KT) -> None: ...
     def __iter__(self) -> Iterator[_KT]: ...
     def __str__(self) -> str: ...
+    __hash__: None  # type: ignore
 
 class set(MutableSet[_T], Generic[_T]):
     def __init__(self, iterable: Iterable[_T] = ...) -> None: ...
@@ -1016,6 +1018,7 @@ class set(MutableSet[_T], Generic[_T]):
     def __lt__(self, s: AbstractSet[object]) -> bool: ...
     def __ge__(self, s: AbstractSet[object]) -> bool: ...
     def __gt__(self, s: AbstractSet[object]) -> bool: ...
+    __hash__: None  # type: ignore
 
 class frozenset(AbstractSet[_T], Generic[_T]):
     def __init__(self, iterable: Iterable[_T] = ...) -> None: ...

third_party/2and3/werkzeug/datastructures.pyi

@@ -11,8 +11,8 @@ def is_immutable(self): ...
 def iter_multi_items(mapping): ...
 def native_itermethods(names): ...
 
-class ImmutableListMixin:
-    def __hash__(self): ...
+class ImmutableListMixin(object):
+    def __hash__(self) -> int: ...
     def __reduce_ex__(self, protocol): ...
     def __delitem__(self, key): ...
     def __delslice__(self, i, j): ...
@@ -28,13 +28,13 @@ class ImmutableListMixin:
     def reverse(self): ...
     def sort(self, cmp: Optional[Any] = ..., key: Optional[Any] = ..., reverse: Optional[Any] = ...): ...
 
-class ImmutableList(ImmutableListMixin, list): ...
+class ImmutableList(ImmutableListMixin, list): ...  # type: ignore
 
-class ImmutableDictMixin:
+class ImmutableDictMixin(object):
     @classmethod
     def fromkeys(cls, *args, **kwargs): ...
     def __reduce_ex__(self, protocol): ...
-    def __hash__(self): ...
+    def __hash__(self) -> int: ...
     def setdefault(self, key, default: Optional[Any] = ...): ...
     def update(self, *args, **kwargs): ...
     def pop(self, key, default: Optional[Any] = ...): ...
@@ -71,7 +71,7 @@ class TypeConversionDict(Dict[_K, _V]):
     @overload
     def get(self, key: _K, default: _D, type: Callable[[_V], _R]) -> Union[_R, _D]: ...
 
-class ImmutableTypeConversionDict(ImmutableDictMixin, TypeConversionDict[_K, _V]):
+class ImmutableTypeConversionDict(ImmutableDictMixin, TypeConversionDict[_K, _V]):  # type: ignore
     def copy(self) -> TypeConversionDict[_K, _V]: ...
     def __copy__(self) -> ImmutableTypeConversionDict[_K, _V]: ...
 
@@ -207,7 +207,7 @@ class EnvironHeaders(ImmutableHeadersMixin, Headers):
     def __iter__(self): ...
     def copy(self): ...
 
-class CombinedMultiDict(ImmutableMultiDictMixin, MultiDict):
+class CombinedMultiDict(ImmutableMultiDictMixin, MultiDict):  # type: ignore
     def __reduce_ex__(self, protocol): ...
     dicts: Any
     def __init__(self, dicts: Optional[Any] = ...): ...
@@ -231,15 +231,15 @@ class CombinedMultiDict(ImmutableMultiDictMixin, MultiDict):
 class FileMultiDict(MultiDict):
     def add_file(self, name, file, filename: Optional[Any] = ..., content_type: Optional[Any] = ...): ...
 
-class ImmutableDict(ImmutableDictMixin, dict):
+class ImmutableDict(ImmutableDictMixin, dict):  # type: ignore
     def copy(self): ...
     def __copy__(self): ...
 
-class ImmutableMultiDict(ImmutableMultiDictMixin, MultiDict):
+class ImmutableMultiDict(ImmutableMultiDictMixin, MultiDict):  # type: ignore
     def copy(self): ...
     def __copy__(self): ...
 
-class ImmutableOrderedMultiDict(ImmutableMultiDictMixin, OrderedMultiDict):
+class ImmutableOrderedMultiDict(ImmutableMultiDictMixin, OrderedMultiDict):  # type: ignore
     def copy(self): ...
     def __copy__(self): ...
 
@@ -280,7 +280,7 @@ class _CacheControl(UpdateDictMixin, dict):
     def __init__(self, values=..., on_update: Optional[Any] = ...): ...
     def to_header(self): ...
 
-class RequestCacheControl(ImmutableDictMixin, _CacheControl):
+class RequestCacheControl(ImmutableDictMixin, _CacheControl):  # type: ignore
     max_stale: Any
     min_fresh: Any
     no_transform: Any
@@ -360,7 +360,7 @@ class ContentRange:
     def __nonzero__(self): ...
     __bool__: Any
 
-class Authorization(ImmutableDictMixin, Dict[str, Any]):
+class Authorization(ImmutableDictMixin, Dict[str, Any]):  # type: ignore
     type: str
     def __init__(self, auth_type: str, data: Optional[Mapping[str, Any]] = ...) -> None: ...
     @property