diff -r d115dc671f52 Objects/floatobject.c
--- a/Objects/floatobject.c	Sun Oct 13 11:34:01 2013 +0100
+++ b/Objects/floatobject.c	Sun Oct 13 13:30:42 2013 +0200
@@ -797,9 +797,8 @@
     return o;
 }
 
-#if 0
 static PyObject *
-float_is_inf(PyObject *v)
+float_is_infinite(PyObject *v)
 {
     double x = PyFloat_AsDouble(v);
     if (x == -1.0 && PyErr_Occurred())
@@ -824,7 +823,6 @@
         return NULL;
     return PyBool_FromLong((long)Py_IS_FINITE(x));
 }
-#endif
 
 static PyObject *
 float_trunc(PyObject *v)
@@ -1740,14 +1738,12 @@
      METH_NOARGS, float_hex_doc},
     {"is_integer",      (PyCFunction)float_is_integer,  METH_NOARGS,
      "Return True if the float is an integer."},
-#if 0
-    {"is_inf",          (PyCFunction)float_is_inf,      METH_NOARGS,
+    {"is_infinite",     (PyCFunction)float_is_infinite, METH_NOARGS,
      "Return True if the float is positive or negative infinite."},
     {"is_finite",       (PyCFunction)float_is_finite,   METH_NOARGS,
      "Return True if the float is finite, neither infinite nor NaN."},
     {"is_nan",          (PyCFunction)float_is_nan,      METH_NOARGS,
      "Return True if the float is not a number (NaN)."},
-#endif
     {"__getnewargs__",          (PyCFunction)float_getnewargs,  METH_NOARGS},
     {"__getformat__",           (PyCFunction)float_getformat,
      METH_O|METH_CLASS,                 float_getformat_doc},