* Return value: the title of the column. This string should not be
* modified or freed.
**/
-G_CONST_RETURN gchar *
+const gchar *
pspp_sheet_view_column_get_title (PsppSheetViewColumn *tree_column)
{
g_return_val_if_fail (PSPP_IS_SHEET_VIEW_COLUMN (tree_column), NULL);