//ww:run-exit 43
// Migrated from 776_memio_vstream_run row dynamic_write_grow.
package main;
import memio;
import io;
import os;
export fn main() i32 = {
    let st: memio.stream = memio.dynamic();
    let s: io.stream = &st.vt;
    let src: [3]u8;
    src[0] = 88u8; src[1] = 89u8; src[2] = 90u8;
    let wr = io.write(s, src[0:3]);
    let n: size = 0;
    if (wr is size) { n = wr as size; };
    let cl = io.close(s);
    if (cl is void && n == 3: size) { return 43; };
    return 99;
};