Adds __subclasshook__ to type, refs #2794

extra_tests/snippets/builtin_type.py

@@ -151,3 +151,10 @@ assert BaseException.args.__qualname__ == 'BaseException.args'
 assert Exception.args.__qualname__ == 'BaseException.args'
 # dynamic with `.new_readonly_getset`
 assert SyntaxError.msg.__qualname__ == 'SyntaxError.msg'
+
+
+# Regression to
+# https://github.com/RustPython/RustPython/issues/2794
+
+assert type.__subclasshook__.__qualname__ == 'type.__subclasshook__'
+assert object.__subclasshook__.__qualname__ == 'object.__subclasshook__'

vm/src/builtins/pytype.rs

@@ -290,6 +290,11 @@ impl PyType {
         subclass.issubclass(&zelf)
     }
 
+    #[pyclassmethod(magic)]
+    fn subclasshook(_args: FuncArgs, vm: &VirtualMachine) -> PyObjectRef {
+        vm.ctx.not_implemented()
+    }
+
     #[pyproperty(magic)]
     fn name(&self) -> String {
         self.name.clone()