Check names of positional arguments for @OverRide

Author: tmke8

mypy/checker.py

@@ -1940,6 +1940,9 @@ def check_method_override_for_base_with_name(
                     original_class_or_static,
                     override_class_or_static,
                     context,
+                    ignore_pos_arg_names=(
+                        not context.is_explicit_override if isinstance(context, FuncDef) else True
+                    ),
                 )
             elif is_equivalent(original_type, typ):
                 # Assume invariance for a non-callable attribute here. Note
@@ -2005,6 +2008,7 @@ def check_override(
         original_class_or_static: bool,
         override_class_or_static: bool,
         node: Context,
+        ignore_pos_arg_names: bool,
     ) -> None:
         """Check a method override with given signatures.
 
@@ -2018,7 +2022,7 @@ def check_override(
         # Use boolean variable to clarify code.
         fail = False
         op_method_wider_note = False
-        if not is_subtype(override, original, ignore_pos_arg_names=True):
+        if not is_subtype(override, original, ignore_pos_arg_names=ignore_pos_arg_names):
             fail = True
         elif isinstance(override, Overloaded) and self.is_forward_op_method(name):
             # Operator method overrides cannot extend the domain, as

test-data/unit/check-functions.test

@@ -2743,9 +2743,11 @@ class B(A):
 
 class C(A):
     @override
-    def f(self, x: str) -> str: pass  # E: Argument 1 of "f" is incompatible with supertype "A"; supertype defines the argument type as "int" \
-                                      # N: This violates the Liskov substitution principle \
-                                      # N: See https://mypy.readthedocs.io/en/stable/common_issues.html#incompatible-overrides
+    def f(self, y: int) -> str: pass  # E: Signature of "f" incompatible with supertype "A" \
+                                      # N:      Superclass:               \
+                                      # N:          def f(self, x: int) -> str \
+                                      # N:      Subclass:                 \
+                                      # N:          def f(self, y: int) -> str
     def g(self, x: int) -> str: pass
 
 class D(A): pass