From 70fe087566d21fdec1dffa90805e6ee485db64ea Mon Sep 17 00:00:00 2001
From: Jeong YunWon <jeong@youknowone.org>
Date: Thu, 15 Aug 2019 15:45:10 +0900
Subject: [PATCH] object.__subclasshook__ empty classmethod

---
 tests/snippets/object.py | 4 ++++
 vm/src/obj/objobject.rs  | 7 ++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/tests/snippets/object.py b/tests/snippets/object.py
index 6845a0b3e..663a2cd76 100644
--- a/tests/snippets/object.py
+++ b/tests/snippets/object.py
@@ -7,6 +7,10 @@ myobj = MyObject()
 assert myobj == myobj
 assert not myobj != myobj
 
+object.__subclasshook__() == NotImplemented
+object.__subclasshook__(1) == NotImplemented
+object.__subclasshook__(1, 2) == NotImplemented
+
 assert MyObject().__eq__(MyObject()) == NotImplemented
 assert MyObject().__ne__(MyObject()) == NotImplemented
 assert MyObject().__lt__(MyObject()) == NotImplemented
diff --git a/vm/src/obj/objobject.rs b/vm/src/obj/objobject.rs
index 8f2408dba..416dd2324 100644
--- a/vm/src/obj/objobject.rs
+++ b/vm/src/obj/objobject.rs
@@ -118,6 +118,10 @@ fn object_repr(zelf: PyObjectRef, _vm: &VirtualMachine) -> String {
     format!("<{} object at 0x{:x}>", zelf.class().name, zelf.get_id())
 }
 
+fn object_subclasshook(vm: &VirtualMachine, _args: PyFuncArgs) -> PyResult {
+    Ok(vm.ctx.not_implemented())
+}
+
 pub fn object_dir(obj: PyObjectRef, vm: &VirtualMachine) -> PyResult<PyList> {
     let attributes: PyAttributes = objtype::get_attributes(obj.class());
 
@@ -179,7 +183,8 @@ pub fn init(context: &PyContext) {
         "__repr__" => context.new_rustfunc(object_repr),
         "__format__" => context.new_rustfunc(object_format),
         "__getattribute__" => context.new_rustfunc(object_getattribute),
-        "__doc__" => context.new_str(object_doc.to_string())
+        "__subclasshook__" => context.new_classmethod(object_subclasshook),
+        "__doc__" => context.new_str(object_doc.to_string()),
     });
 }