PySymtableEntry_New(): I'm not sure what this routine is doing, but it

was obviously leaking an int object when whatever the heck it's looking for
was found.  Repaired that.  This accounts for why entering function and
class definitions at an interactive prompt leaked a reference to the
integer 1 each time.
Bugfix candidate.

Python/symtable.c

@@ -15,6 +15,7 @@ PySymtableEntry_New(struct symtable *st, char *name, int type, int lineno)
 		goto fail;
 	v = PyDict_GetItem(st->st_symbols, k);
 	if (v) /* XXX could check that name, type, lineno match */ {
+		Py_DECREF(k);
 		Py_INCREF(v);
 		return v;
 	}