//ww:run-exit 49
// Migrated from 778_bufio_vstream_run row isbuffered_v_boundary.
package main;
import bufio;
import memio;
import io;
export fn main() i32 = {
    let raw: [8]u8;
    let mst: memio.stream = memio.fixed(raw[0:8]);
    let msrc: io.stream = &mst.vt;
    let rbuf: [4]u8;
    let wbuf: [4]u8;
    let bc: bufio.stream = bufio.init(msrc, rbuf[0:4], wbuf[0:4]);
    let vs: io.stream = &bc.vt;
    if (!bufio.isbuffered(vs)) { return 91; };
    if (bufio.isbuffered(msrc)) { return 92; };
    return 49;
};