-error_fun_ret4.nit:17,5--8: Control error: Reached end of function (a 'return' with a value was expected).
+error_fun_ret4.nit:17,5--8: Error: reached end of function; expected `return` with a value.
error_fun_ret4.nit:19,2--22,4: Warning: use `loop` instead of `while true do`.