//ww:run-exit 43
// Migrated from 777_fmt_handle_run row fprintln_file_multi.
package main;
import os;
import fmt;
import io;
export fn main() i32 = {
    let path: str = "wwfmth_777_b";
    let fd: i32 = os.open(path, os.flag.RDWR | os.flag.CREATE | os.flag.TRUNC, 0o644: i32);
    if (fd < 0) { return 90; };
    let wr = fmt.fprintln(fd: io.file, 7i64, "hi", true);
    let nw: size = 0;
    match (wr) {
    case let n: size => { nw = n; };
    case io.error => { return 91; };
    };
    os.close(fd);
    let rd: i32 = os.open(path, os.flag.RDONLY, 0i32);
    if (rd < 0) { return 92; };
    let buf: [16]u8;
    let n: i64 = os.read(rd, &buf[0], 16u64);
    os.close(rd);
    if (n != 10i64) { return 93; };
    if (nw != 10: size) { return 94; };
    if (buf[0] != 55u8 || buf[1] != 32u8 || buf[2] != 104u8 || buf[3] != 105u8 || buf[4] != 32u8 || buf[5] != 116u8 || buf[6] != 114u8 || buf[7] != 117u8 || buf[8] != 101u8 || buf[9] != 10u8) { return 95; };
    return 43;
};