Fix [ #489673 ] memory leak in test_symtable: Free the st_future slot.
The st_future slot of the symtable is not freed by PySymtable_Free()
because it is shared by the symtable and compiling structs in
compiel.c. Since it is shared, it is explicitly deallocated when the
compiling struct is freed.
diff --git a/Modules/symtablemodule.c b/Modules/symtablemodule.c
index 2452521..e24e72f 100644
--- a/Modules/symtablemodule.c
+++ b/Modules/symtablemodule.c
@@ -32,6 +32,7 @@
if (st == NULL)
return NULL;
t = Py_BuildValue("O", st->st_symbols);
+ PyMem_Free((void *)st->st_future);
PySymtable_Free(st);
return t;
}