}
if (father->kind == TYPE_VARIABLE)
THROWF(tracing_error, 0, "variables can't have different values (%s)", father->name);
val_t ret = (val_t)xbt_dict_get_or_null (father->values, name);
}
if (father->kind == TYPE_VARIABLE)
THROWF(tracing_error, 0, "variables can't have different values (%s)", father->name);
val_t ret = (val_t)xbt_dict_get_or_null (father->values, name);