./error_expr_not_ok.nit:66,21: Type error: expected A, got Int
./error_expr_not_ok.nit:67,15--18: Error: Method or variable 'fail' unknown in Sys.
./error_expr_not_ok.nit:69,10--13: Error: Method or variable 'fail' unknown in Sys.
+./error_expr_not_ok.nit:69,24: Type error: expected A, got Int
./error_expr_not_ok.nit:70,20--23: Error: Method or variable 'fail' unknown in Sys.
./error_expr_not_ok.nit:71,8--11: Error: Method or variable 'fail' unknown in Sys.
./error_expr_not_ok.nit:72,12--15: Error: Method or variable 'fail' unknown in Sys.