alt/error_type_unk_alt7.nit:20,15--18: Error: class `Fail` not found in module `error_type_unk_alt7`.
alt/error_type_unk_alt7.nit:22,17--20: Error: class `Fail` not found in module `error_type_unk_alt7`.
alt/error_type_unk_alt7.nit:23,9: Error: method `+` does not exists in `Bool`.
alt/error_type_unk_alt7.nit:24,16--19: Error: class `Fail` not found in module `error_type_unk_alt7`.