Defer PEP 547 (python#656)

pep-0547.rst

@@ -4,14 +4,25 @@ Version: $Revision$
 Last-Modified: $Date$
 Author: Marcel Plch <[email protected]>,
         Petr Viktorin <[email protected]>
-Status: Draft
+Status: Deferred
 Type: Standards Track
 Content-Type: text/x-rst
 Created: 25-May-2017
 Python-Version: 3.7
 Post-History: 
 
 
+Deferral Notice
+===============
+
+Cython -- the most important use case for this PEP and the only explicit
+one -- is not ready for multi-phase initialization yet.
+It keeps global state in C-level static variables.
+See discussion at `Cython issue 1923`_.
+
+The PEP is deferred until the situation changes.
+
+
 Abstract
 ========
 
@@ -186,6 +197,7 @@ References
 .. _GitHub: https://github.com/python/cpython/pull/1761
 .. _Cython issue 1715: https://github.com/cython/cython/issues/1715
 .. _Possible Future Extensions section: https://www.python.org/dev/peps/pep-0489/#possible-future-extensions
+.. _Cython issue 1923: https://github.com/cython/cython/pull/1923
 
 
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