@@ -1015,13 +1015,13 @@ def expand_typevars(self, defn: FuncItem,
10151015 else :
10161016 return [(defn , typ )]
10171017
1018- def check_method_override (self , defn : FuncBase ) -> None :
1018+ def check_method_override (self , defn : Union [ FuncBase , Decorator ] ) -> None :
10191019 """Check if function definition is compatible with base classes."""
10201020 # Check against definitions in base classes.
10211021 for base in defn .info .mro [1 :]:
10221022 self .check_method_or_accessor_override_for_base (defn , base )
10231023
1024- def check_method_or_accessor_override_for_base (self , defn : FuncBase ,
1024+ def check_method_or_accessor_override_for_base (self , defn : Union [ FuncBase , Decorator ] ,
10251025 base : TypeInfo ) -> None :
10261026 """Check if method definition is compatible with a base class."""
10271027 if base :
@@ -1041,13 +1041,26 @@ def check_method_or_accessor_override_for_base(self, defn: FuncBase,
10411041 base )
10421042
10431043 def check_method_override_for_base_with_name (
1044- self , defn : FuncBase , name : str , base : TypeInfo ) -> None :
1044+ self , defn : Union [ FuncBase , Decorator ] , name : str , base : TypeInfo ) -> None :
10451045 base_attr = base .names .get (name )
10461046 if base_attr :
10471047 # The name of the method is defined in the base class.
10481048
1049+ # Point errors at the 'def' line (important for backward compatibility
1050+ # of type ignores).
1051+ if not isinstance (defn , Decorator ):
1052+ context = defn
1053+ else :
1054+ context = defn .func
10491055 # Construct the type of the overriding method.
1050- typ = bind_self (self .function_type (defn ), self .scope .active_self_type ())
1056+ if isinstance (defn , FuncBase ):
1057+ typ = self .function_type (defn ) # type: Type
1058+ else :
1059+ assert defn .var .is_ready
1060+ assert defn .var .type is not None
1061+ typ = defn .var .type
1062+ if isinstance (typ , FunctionLike ) and not is_static (context ):
1063+ typ = bind_self (typ , self .scope .active_self_type ())
10511064 # Map the overridden method type to subtype context so that
10521065 # it can be checked for compatibility.
10531066 original_type = base_attr .type
@@ -1058,23 +1071,33 @@ def check_method_override_for_base_with_name(
10581071 original_type = self .function_type (base_attr .node .func )
10591072 else :
10601073 assert False , str (base_attr .node )
1061- if isinstance (original_type , FunctionLike ):
1062- original = map_type_from_supertype (
1063- bind_self (original_type , self .scope .active_self_type ()),
1064- defn .info , base )
1074+ if isinstance (original_type , AnyType ) or isinstance (typ , AnyType ):
1075+ pass
1076+ elif isinstance (original_type , FunctionLike ) and isinstance (typ , FunctionLike ):
1077+ if (isinstance (base_attr .node , (FuncBase , Decorator ))
1078+ and not is_static (base_attr .node )):
1079+ bound = bind_self (original_type , self .scope .active_self_type ())
1080+ else :
1081+ bound = original_type
1082+ original = map_type_from_supertype (bound , defn .info , base )
10651083 # Check that the types are compatible.
10661084 # TODO overloaded signatures
10671085 self .check_override (typ ,
10681086 cast (FunctionLike , original ),
10691087 defn .name (),
10701088 name ,
10711089 base .name (),
1072- defn )
1073- elif isinstance (original_type , AnyType ):
1090+ context )
1091+ elif is_equivalent (original_type , typ ):
1092+ # Assume invariance for a non-callable attribute here. Note
1093+ # that this doesn't affect read-only properties which can have
1094+ # covariant overrides.
1095+ #
1096+ # TODO: Allow covariance for read-only attributes?
10741097 pass
10751098 else :
10761099 self .msg .signature_incompatible_with_supertype (
1077- defn .name (), name , base .name (), defn )
1100+ defn .name (), name , base .name (), context )
10781101
10791102 def check_override (self , override : FunctionLike , original : FunctionLike ,
10801103 name : str , name_in_super : str , supertype : str ,
@@ -1966,7 +1989,7 @@ def try_infer_partial_type_from_indexed_assignment(
19661989 if not self .current_node_deferred :
19671990 var .type = self .named_generic_type ('builtins.dict' ,
19681991 [full_key_type , full_value_type ])
1969- del partial_types [var ]
1992+ del partial_types [var ]
19701993
19711994 def visit_expression_stmt (self , s : ExpressionStmt ) -> None :
19721995 self .expr_checker .accept (s .expr , allow_none_return = True , always_allow_any = True )
@@ -2015,7 +2038,7 @@ def check_return_stmt(self, s: ReturnStmt) -> None:
20152038 # function is not declared to return Any)
20162039 if (self .options .warn_return_any and
20172040 not is_proper_subtype (AnyType (TypeOfAny .special_form ), return_type )):
2018- self .warn ( messages . RETURN_ANY . format (return_type ) , s )
2041+ self .msg . incorrectly_returning_any (return_type , s )
20192042 return
20202043
20212044 # Disallow return expressions in functions declared to return
@@ -2364,9 +2387,11 @@ def visit_decorator(self, e: Decorator) -> None:
23642387 e .var .is_ready = True
23652388 return
23662389
2367- e .func .accept (self )
2390+ self .check_func_item (e .func , name = e .func .name ())
2391+
2392+ # Process decorators from the inside out to determine decorated signature, which
2393+ # may be different from the declared signature.
23682394 sig = self .function_type (e .func ) # type: Type
2369- # Process decorators from the inside out.
23702395 for d in reversed (e .decorators ):
23712396 if refers_to_fullname (d , 'typing.overload' ):
23722397 self .fail ('Single overload definition, multiple required' , e )
@@ -2387,6 +2412,8 @@ def visit_decorator(self, e: Decorator) -> None:
23872412 e .var .is_ready = True
23882413 if e .func .is_property :
23892414 self .check_incompatible_property_override (e )
2415+ if e .func .info and not e .func .is_dynamic ():
2416+ self .check_method_override (e )
23902417
23912418 def check_for_untyped_decorator (self ,
23922419 func : FuncDef ,
@@ -3316,3 +3343,13 @@ def is_untyped_decorator(typ: Optional[Type]) -> bool:
33163343 if not typ or not isinstance (typ , CallableType ):
33173344 return True
33183345 return typ .implicit
3346+
3347+
3348+ def is_static (func : Union [FuncBase , Decorator ]) -> bool :
3349+ if isinstance (func , Decorator ):
3350+ return is_static (func .func )
3351+ elif isinstance (func , OverloadedFuncDef ):
3352+ return any (is_static (item ) for item in func .items )
3353+ elif isinstance (func , FuncItem ):
3354+ return func .is_static
3355+ return False
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