From f5eec903fa961135296e2656821450979e413248 Mon Sep 17 00:00:00 2001
From: Damien George <damien.p.george@gmail.com>
Date: Mon, 23 Dec 2019 00:00:53 +1100
Subject: [PATCH] py/objsingleton: Use mp_generic_unary_op for singleton
 objects.

So these types more closely match NoneType, eg they can be hashed, like in
CPython.
---
 py/objsingleton.c                | 1 +
 tests/basics/builtin_ellipsis.py | 3 +++
 tests/basics/class_notimpl.py    | 3 +++
 3 files changed, 7 insertions(+)

diff --git a/py/objsingleton.c b/py/objsingleton.c
index 67535391ea..2b896305cf 100644
--- a/py/objsingleton.c
+++ b/py/objsingleton.c
@@ -47,6 +47,7 @@ const mp_obj_type_t mp_type_singleton = {
     { &mp_type_type },
     .name = MP_QSTR_,
     .print = singleton_print,
+    .unary_op = mp_generic_unary_op,
 };
 
 const mp_obj_singleton_t mp_const_ellipsis_obj = {{&mp_type_singleton}, MP_QSTR_Ellipsis};
diff --git a/tests/basics/builtin_ellipsis.py b/tests/basics/builtin_ellipsis.py
index d88647a89a..d66e86de4a 100644
--- a/tests/basics/builtin_ellipsis.py
+++ b/tests/basics/builtin_ellipsis.py
@@ -4,3 +4,6 @@ print(...)
 print(Ellipsis)
 
 print(... == Ellipsis)
+
+# Test that Ellipsis can be hashed
+print(type(hash(Ellipsis)))
diff --git a/tests/basics/class_notimpl.py b/tests/basics/class_notimpl.py
index 308075f92f..58e790716b 100644
--- a/tests/basics/class_notimpl.py
+++ b/tests/basics/class_notimpl.py
@@ -48,3 +48,6 @@ except TypeError:
 
 # NotImplemented isn't handled specially in unary methods
 print(-c)
+
+# Test that NotImplemented can be hashed
+print(type(hash(NotImplemented)))