Added a FutureWarning for constructs that will change semantically in

the future.  Changed PEP 237 hex constant warnings from
DeprecationWarning to FutureWarning.  Updated the documentation.

Include/pyerrors.h

@@ -70,6 +70,7 @@ PyAPI_DATA(PyObject *) PyExc_PendingDeprecationWarning;
 PyAPI_DATA(PyObject *) PyExc_SyntaxWarning;
 PyAPI_DATA(PyObject *) PyExc_OverflowWarning;
 PyAPI_DATA(PyObject *) PyExc_RuntimeWarning;
+PyAPI_DATA(PyObject *) PyExc_FutureWarning;
 
 
 /* Convenience functions */

Python/compile.c

@@ -1158,7 +1158,7 @@ parsenumber(struct compiling *co, char *s)
 		x = (long) PyOS_strtoul(s, &end, 0);
 		if (x < 0 && errno == 0) {
 			if (PyErr_WarnExplicit(
-				    PyExc_DeprecationWarning,
+				    PyExc_FutureWarning,
 				    "hex/oct constants > sys.maxint "
 				    "will return positive values "
 				    "in Python 2.4 and up",

Python/exceptions.c

@@ -112,7 +112,8 @@ Exception\n\
       +-- PendingDeprecationWarning\n\
       +-- SyntaxWarning\n\
       +-- OverflowWarning\n\
-      +-- RuntimeWarning"
+      +-- RuntimeWarning\n\
+      +-- FutureWarning"
 );
 
 
@@ -902,6 +903,10 @@ PyDoc_STRVAR(OverflowWarning__doc__,
 PyDoc_STRVAR(RuntimeWarning__doc__,
 "Base class for warnings about dubious runtime behavior.");
 
+PyDoc_STRVAR(FutureWarning__doc__,
+"Base class for warnings about constructs that will change semantically "
+"in the future.");
+
 
 
 /* module global functions */
@@ -964,6 +969,7 @@ PyObject *PyExc_PendingDeprecationWarning;
 PyObject *PyExc_SyntaxWarning;
 PyObject *PyExc_OverflowWarning;
 PyObject *PyExc_RuntimeWarning;
+PyObject *PyExc_FutureWarning;
 
 
 
@@ -1044,6 +1050,8 @@ static struct {
   OverflowWarning__doc__},
  {"RuntimeWarning", &PyExc_RuntimeWarning, &PyExc_Warning,
   RuntimeWarning__doc__},
+ {"FutureWarning", &PyExc_FutureWarning, &PyExc_Warning,
+  FutureWarning__doc__},
  /* Sentinel */
  {NULL}
 };