error_expr_not_ok.nit:66,7--10: Error: Method or variable 'fail' unknown in Sys.
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:67,1--18: Warning: use 'loop' instead of 'while true do'.
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:127,1--4: Error: Method or variable 'fail' unknown in Sys.
error_expr_not_ok.nit:128,1--4: Error: Method or variable 'fail' unknown in Sys.
error_expr_not_ok.nit:131,11--14: Error: Method or variable 'fail' unknown in Sys.
-error_expr_not_ok.nit:131,7--14: Type error: expected A, got Int
+error_expr_not_ok.nit:131,7--15: Type error: expected A, got Int
error_expr_not_ok.nit:132,10--13: Error: Method or variable 'fail' unknown in Sys.
error_expr_not_ok.nit:133,11--14: Error: Method or variable 'fail' unknown in Sys.
error_expr_not_ok.nit:134,7--10: Error: Method or variable 'fail' unknown in Sys.