make Py_hash_t a known type

CHANGES.rst

@@ -8,6 +8,8 @@ Latest
 Features added
 --------------
 
+* ``Py_hash_t`` is a known type (used in CPython for hash values).
+
 * ``PySlice_*()`` C-API functions are available from the ``cpython.slice``
   module.
 

Cython/Compiler/Parsing.py

@@ -2285,6 +2285,7 @@ special_basic_c_types = cython.declare(dict, {
     # name : (signed, longness)
     "Py_UNICODE" : (0, 0),
     "Py_UCS4"    : (0, 0),
+    "Py_hash_t"  : (2, 0),
     "Py_ssize_t" : (2, 0),
     "ssize_t"    : (2, 0),
     "size_t"     : (0, 0),

tests/run/py_hash_t.pyx

+
+cimport cython
+
+
+def assign_py_hash_t(x):
+    """
+    >>> assign_py_hash_t(12)
+    12
+    >>> assign_py_hash_t(-12)
+    -12
+    """
+    cdef Py_hash_t h = x
+    return h
+
+
+def infer_hash_type(x):
+    """
+    >>> infer_hash_type(123)
+    'Py_hash_t'
+    """
+    h = hash(x)
+    return cython.typeof(h)
+
+
+def assign_to_name(x):
+    """
+    >>> assign_to_name(321)
+    321
+    """
+    Py_hash_t = x
+    return Py_hash_t