Issue #15167 (as part of #13959): imp.get_magic() is no implemented in
Lib/imp.py.
diff --git a/Doc/whatsnew/3.3.rst b/Doc/whatsnew/3.3.rst
index e2deb9a..fd4a726 100644
--- a/Doc/whatsnew/3.3.rst
+++ b/Doc/whatsnew/3.3.rst
@@ -1761,6 +1761,9 @@
   :c:func:`PyUnicode_FromFormat()`, your code will automatically take
   advantage of the new unicode representations.
 
+* :c:func:`PyImport_GetMagicNumber` now returns -1 upon failure.
+
+
 Building C extensions
 ---------------------