//ww:run-exit 42
// Migrated from 776_memio_vstream_run row fixed_read_5.
package main;
import memio;
import io;
import os;
export fn main() i32 = {
    let buf: [8]u8;
    buf[0] = 65u8; buf[1] = 66u8; buf[2] = 67u8; buf[3] = 68u8;
    buf[4] = 69u8; buf[5] = 70u8; buf[6] = 71u8; buf[7] = 72u8;
    let st: memio.stream = memio.fixed(buf[0:8]);
    let s: io.stream = &st.vt;
    let out: [5]u8;
    let n: size = 0;
    let rd = io.read(s, out[0:5]);
    if (rd is size) { n = rd as size; };
    if (n == 5: size && out[0] == 65u8 && out[4] == 69u8) { return 42; };
    return 99;
};