Better error messages when raising ValueError for int and long

literals.  (The previous version of this code would not show the
offending input, even though there was code that attempted this.)

Objects/abstract.c

@@ -69,13 +69,12 @@ int_from_string(v)
 		s++;
 	errno = 0;
 	x = PyOS_strtol(s, &end, 10);
-	if (end == s || !isdigit(end[-1])) {
-		PyErr_SetString(PyExc_ValueError, "no digits in int constant");
-		return NULL;
-	}
+	if (end == s || !isdigit(end[-1]))
+		goto bad;
 	while (*end && isspace(Py_CHARMASK(*end)))
 		end++;
 	if (*end != '\0') {
+  bad:
 		sprintf(buffer, "invalid literal for int(): %.200s", s);
 		PyErr_SetString(PyExc_ValueError, buffer);
 		return NULL;
@@ -105,14 +104,18 @@ long_from_string(v)
 	while (*s && isspace(Py_CHARMASK(*s)))
 		s++;
 	x = PyLong_FromString(s, &end, 10);
-	if (x == NULL)
+	if (x == NULL) {
+		if (PyErr_ExceptionMatches(PyExc_ValueError))
+			goto bad;
 		return NULL;
+	}
 	while (*end && isspace(Py_CHARMASK(*end)))
 		end++;
 	if (*end != '\0') {
+  bad:
 		sprintf(buffer, "invalid literal for long(): %.200s", s);
 		PyErr_SetString(PyExc_ValueError, buffer);
-		Py_DECREF(x);
+		Py_XDECREF(x);
 		return NULL;
 	}
 	else if (end != PyString_AS_STRING(v) + PyString_GET_SIZE(v)) {