Fix crash when super outside of method is called (#9173)

* Fix crash when super outside of method is called

* Change error message

* empty

Author: Unattend

mypy/checkexpr.py

@@ -3464,6 +3464,10 @@ def visit_super_expr(self, e: SuperExpr) -> Type:
             self.chk.fail(message_registry.SUPER_ARG_2_NOT_INSTANCE_OF_ARG_1, e)
             return AnyType(TypeOfAny.from_error)
 
+        if len(mro) == index + 1:
+            self.chk.fail(message_registry.TARGET_CLASS_HAS_NO_BASE_CLASS, e)
+            return AnyType(TypeOfAny.from_error)
+
         for base in mro[index+1:]:
             if e.name in base.names or base == mro[-1]:
                 if e.info and e.info.fallback_to_any and base == mro[-1]:

mypy/message_registry.py

@@ -109,6 +109,7 @@
 SUPER_POSITIONAL_ARGS_REQUIRED = '"super" only accepts positional arguments'  # type: Final
 SUPER_ARG_2_NOT_INSTANCE_OF_ARG_1 = \
     'Argument 2 for "super" not an instance of argument 1'  # type: Final
+TARGET_CLASS_HAS_NO_BASE_CLASS = 'Target class has no base class'  # type: Final
 SUPER_OUTSIDE_OF_METHOD_NOT_SUPPORTED = \
     'super() outside of a method is not supported'  # type: Final
 SUPER_ENCLOSING_POSITIONAL_ARGS_REQUIRED = \

test-data/unit/check-super.test

@@ -280,6 +280,20 @@ class B(A):
 class C:
     a = super().whatever  # E: super() outside of a method is not supported
 
+[case testSuperWithObjectClassAsFirstArgument]
+class A:
+    def f(self) -> None:
+        super(object, self).f()  # E: Target class has no base class
+
+[case testSuperWithTypeVarAsFirstArgument]
+from typing import TypeVar
+
+T = TypeVar('T')
+
+def f(obj: T) -> None:
+    super(obj.__class__, obj).f()  # E: Target class has no base class
+[builtins fixtures/__new__.pyi]
+
 [case testSuperWithSingleArgument]
 class B:
     def f(self) -> None: pass

test-data/unit/fixtures/__new__.pyi

@@ -5,6 +5,8 @@ from typing import Any
 class object:
     def __init__(self) -> None: pass
 
+    __class__ = object
+
     def __new__(cls) -> Any: pass
 
 class type: