Docs: Mention that Py_UNREACHABLE was added in 3.7 (#4337)

encukou · serhiy-storchaka · commit 8bf288e2c533 · 2017-11-08T15:11:16.000+02:00
The macro was added for bpo-31338 in commit b2e5794
diff --git a/Doc/c-api/intro.rst b/Doc/c-api/intro.rst
@@ -106,6 +106,8 @@ complete listing.
    all possible values are covered in ``case`` statements.  Use this in places
    where you might be tempted to put an ``assert(0)`` or ``abort()`` call.
 
+   .. versionadded:: 3.7
+
 .. c:macro:: Py_ABS(x)
 
    Return the absolute value of ``x``.
