From c0f38e22630f04e86c57fb7f56dac4697cf1fbdb Mon Sep 17 00:00:00 2001
From: sobolevn <mail@sobolevn.me>
Date: Mon, 9 Aug 2021 16:33:57 +0300
Subject: [PATCH] Adds `__subclasshook__` to `type`, refs #2794

---
 extra_tests/snippets/builtin_type.py | 7 +++++++
 vm/src/builtins/pytype.rs            | 5 +++++
 2 files changed, 12 insertions(+)

diff --git a/extra_tests/snippets/builtin_type.py b/extra_tests/snippets/builtin_type.py
index 4f0581eed..a82c87e6c 100644
--- a/extra_tests/snippets/builtin_type.py
+++ b/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__'
diff --git a/vm/src/builtins/pytype.rs b/vm/src/builtins/pytype.rs
index 7cd4789e2..11f412c22 100644
--- a/vm/src/builtins/pytype.rs
+++ b/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()