diff -U3 -r cython-0.29.17.orig/Cython/Compiler/ExprNodes.py cython-0.29.17/Cython/Compiler/ExprNodes.py

--- cython-0.29.17.orig/Cython/Compiler/ExprNodes.py	2020-04-26 13:48:48.000000000 +0200

+++ cython-0.29.17/Cython/Compiler/ExprNodes.py	2020-05-15 17:44:55.157172257 +0200

@@ -2295,8 +2295,10 @@

                 setter = 'PyDict_SetItem'

                 namespace = Naming.moddict_cname

             elif entry.is_pyclass_attr:

-                code.globalstate.use_utility_code(UtilityCode.load_cached("SetNameInClass", "ObjectHandling.c"))

-                setter = '__Pyx_SetNameInClass'

+                # Special-case setting __new__

+                n = "SetNewInClass" if self.name == "__new__" else "SetNameInClass"

+                code.globalstate.use_utility_code(UtilityCode.load_cached(n, "ObjectHandling.c"))

+                setter = '__Pyx_' + n

             else:

                 assert False, repr(entry)

             code.put_error_if_neg(

diff -U3 -r cython-0.29.17.orig/Cython/Compiler/Nodes.py cython-0.29.17/Cython/Compiler/Nodes.py

--- cython-0.29.17.orig/Cython/Compiler/Nodes.py	2020-04-26 13:48:48.000000000 +0200

+++ cython-0.29.17/Cython/Compiler/Nodes.py	2020-05-15 17:44:55.159172253 +0200

@@ -2872,7 +2872,6 @@

                 func = decorator.decorator

                 if func.is_name:

                     self.is_classmethod |= func.name == 'classmethod'

-                    self.is_staticmethod |= func.name == 'staticmethod'

         if self.is_classmethod and env.lookup_here('classmethod'):

             # classmethod() was overridden - not much we can do here ...

diff -U3 -r cython-0.29.17.orig/Cython/Utility/CythonFunction.c cython-0.29.17/Cython/Utility/CythonFunction.c

--- cython-0.29.17.orig/Cython/Utility/CythonFunction.c	2020-04-26 13:48:48.000000000 +0200

+++ cython-0.29.17/Cython/Utility/CythonFunction.c	2020-05-15 17:44:55.160172251 +0200

@@ -548,21 +548,6 @@

 static PyObject *__Pyx_CyFunction_descr_get(PyObject *func, PyObject *obj, PyObject *type)

 {

-    __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *) func;

-

-    if (m->flags & __Pyx_CYFUNCTION_STATICMETHOD) {

-        Py_INCREF(func);

-        return func;

-    }

-

-    if (m->flags & __Pyx_CYFUNCTION_CLASSMETHOD) {

-        if (type == NULL)

-            type = (PyObject *)(Py_TYPE(obj));

-        return __Pyx_PyMethod_New(func, type, (PyObject *)(Py_TYPE(type)));

-    }

-

-    if (obj == Py_None)

-        obj = NULL;

     return __Pyx_PyMethod_New(func, obj, type);

 }

diff -U3 -r cython-0.29.17.orig/Cython/Utility/ObjectHandling.c cython-0.29.17/Cython/Utility/ObjectHandling.c

--- cython-0.29.17.orig/Cython/Utility/ObjectHandling.c	2020-04-26 13:48:48.000000000 +0200

+++ cython-0.29.17/Cython/Utility/ObjectHandling.c	2020-05-15 17:44:55.160172251 +0200

@@ -1163,6 +1163,30 @@

 #define __Pyx_SetNameInClass(ns, name, value)  PyObject_SetItem(ns, name, value)

 #endif

+/////////////// SetNewInClass.proto ///////////////

+

+static int __Pyx_SetNewInClass(PyObject *ns, PyObject *name, PyObject *value);

+

+/////////////// SetNewInClass ///////////////

+//@requires: SetNameInClass

+

+// Special-case setting __new__: if it's a Cython function, wrap it in a

+// staticmethod. This is similar to what Python does for a Python function

+// called __new__.

+static int __Pyx_SetNewInClass(PyObject *ns, PyObject *name, PyObject *value) {

+#ifdef __Pyx_CyFunction_USED

+    int ret;

+    if (__Pyx_CyFunction_Check(value)) {

+        PyObject *staticnew = PyStaticMethod_New(value);

+        if (unlikely(!staticnew)) return -1;

+        ret = __Pyx_SetNameInClass(ns, name, staticnew);

+        Py_DECREF(staticnew);

+        return ret;

+    }

+#endif

+    return __Pyx_SetNameInClass(ns, name, value);

+}

+

 /////////////// GetModuleGlobalName.proto ///////////////

 //@requires: PyDictVersioning

Only in cython-0.29.17.orig: cython-0.29.17

diff -U3 -r cython-0.29.17.orig/tests/run/cyfunction.pyx cython-0.29.17/tests/run/cyfunction.pyx

--- cython-0.29.17.orig/tests/run/cyfunction.pyx	2020-04-26 13:48:48.000000000 +0200

+++ cython-0.29.17/tests/run/cyfunction.pyx	2020-05-15 17:44:55.160172251 +0200

@@ -376,6 +376,18 @@

     def meth(self): pass

+class TestStaticmethod(object):

+    """

+    >>> x = TestStaticmethod()

+    >>> x.staticmeth(42)

+    42

+    >>> x.staticmeth.__get__(42)()

+    42

+    """

+    @staticmethod

+    def staticmeth(arg): return arg

+

+

 cdef class TestOptimisedBuiltinMethod:

     """

     >>> obj = TestOptimisedBuiltinMethod()

diff -U3 -r cython-0.29.17.orig/tests/run/fused_def.pyx cython-0.29.17/tests/run/fused_def.pyx

--- cython-0.29.17.orig/tests/run/fused_def.pyx	2020-04-26 13:48:48.000000000 +0200

+++ cython-0.29.17/tests/run/fused_def.pyx	2020-05-15 18:03:39.436752174 +0200

@@ -268,14 +268,6 @@

 def test_fused_def_super():

     """

     >>> test_fused_def_super()

-    long 10

-    long 11

-    long 11

-    long 12

-    short 12

-    long 13

-    short 13

-    long 14

     <class 'fused_def.SubClass'> long 14

     <class 'fused_def.SubClass'> long 15

     <class 'fused_def.SubClass'> long 15

@@ -296,11 +288,6 @@

     obj = SubClass()

     cls = SubClass

-    obj.mystaticmethod(obj, 10)

-    cls.mystaticmethod(obj, 11)

-    obj.mystaticmethod[cy.short](obj, 12)

-    cls.mystaticmethod[cy.short](obj, 13)

-

     obj.myclassmethod(14)

     cls.myclassmethod(15)

     obj.myclassmethod[cy.short](16)