text: var memory;
  var failed;
  
  export function preInstantiate(imports, exports) {
    imports["wasi_snapshot_preview1"] = {
      fd_write: function(fd, iov, iov_len, nptr) {
        if (fd != 2) failed = "unexpected fd: " + fd;
        const messagePtr = new Uint32Array(memory.buffer)[ iov >>> 2     ];
        const messageLen = new Uint32Array(memory.buffer)[(iov >>> 2) + 1];
        const message = Array.from(new Uint8Array(memory.buffer, messagePtr, messageLen)).map(c => String.fromCharCode(c)).join("");
        process.stderr.write(message);
      },
      proc_exit: function(code) {
        console.log("exit: " + code);
      }
    };
  }
  
  export function postInstantiate(instance) {
    const exports = instance.exports;
    memory = exports.memory;
    if (failed) throw Error(failed);
  }
  