//ww:run-exit 53
// Migrated from 778_bufio_vstream_run row scanner_byte_bytes.
package main;
import bufio;
import errors;
import memio;
import io;
export fn main() i32 = {
    let raw: [6]u8;
    raw[0]=65u8; raw[1]=66u8; raw[2]=44u8;
    raw[3]=67u8; raw[4]=68u8; raw[5]=44u8;
    let mst: memio.stream = memio.dynamicfrom(raw[0:6]);
    let vs: io.stream = &mst.vt;
    let win: [8]u8;
    let sc: bufio.scanner = bufio.newscannerbuf(vs, win[0:8]);
    let fb: u8 = 0u8;
    match (bufio.scanbyte(&sc)) {
    case let b: u8 => { fb = b; };
    case io.eof => { return 81; };
    case let e: io.error => { return 82; };
    case errors.overflow => { return 92; };
    };
    if (fb != 65u8) { return 83; };
    match (bufio.scanbytes(&sc, 44u8)) {
    case let bs: []u8 => { if (bs.len != 1 || bs[0] != 66u8) { return 84; }; };
    case io.eof => { return 85; };
    case let e: io.error => { return 86; };
    case errors.overflow => { return 87; };
    };
    match (bufio.scanbytes(&sc, 44u8)) {
    case let bs: []u8 => { if (bs.len != 2 || bs[0] != 67u8 || bs[1] != 68u8) { return 88; }; };
    case io.eof => { return 89; };
    case let e: io.error => { return 90; };
    case errors.overflow => { return 91; };
    };
    return 53;
};