error_type_unk.nit:22,17--20: Error: class `Fail` not found in module `error_type_unk`.
-error_type_unk.nit:23,7--11: Error: method `+` does not exists in `Bool`.
+error_type_unk.nit:23,9: Error: method `+` does not exists in `Bool`.
+error_type_unk.nit:24,16--19: Error: class `Fail` not found in module `error_type_unk`.