-alt/base_prot_sig_vt_alt8.nit:53,2--10: Error: The only legal visibility for properties in a private class is private.
-alt/base_prot_sig_vt_alt8.nit:57,2--10: Error: The only legal visibility for properties in a private class is private.
+alt/base_prot_sig_vt_alt8.nit:53,2--10: Error: `private` is the only legal visibility for properties in a private class.
+alt/base_prot_sig_vt_alt8.nit:57,2--10: Error: `private` is the only legal visibility for properties in a private class.