//ww:run-exit 54
// Migrated from 778_bufio_vstream_run row stream_setflush.
package main;
import os;
import bufio;
import memio;
import io;
export fn main() i32 = {
    let sinkbuf: [16]u8;
    let sink: memio.stream = memio.fixed(sinkbuf[0:16]);
    let sinkvs: io.stream = &sink.vt;
    let rb: [4]u8;
    let wb: [8]u8;
    let b: bufio.stream = bufio.init(sinkvs, rb[0:4], wb[0:8]);
    let bvs: io.stream = &b.vt;
    let semi: [1]u8;
    semi[0] = 59u8;
    bufio.setflush(&b, semi[0:1]);
    let payload: [3]u8;
    payload[0]=97u8; payload[1]=98u8; payload[2]=59u8;
    let wr = io.write(bvs, payload[0:3]);
    if (!(wr is size)) { return 81; };
    if (sink.pos != 3) { return 82; };
    if (sinkbuf[0] != 97u8 || sinkbuf[2] != 59u8) { return 83; };
    return 54;
};