Update io.rs

src/io.rs

@@ -20,6 +20,18 @@ pub fn get_stream_length<S: Seek>(stream: &mut S) -> io::Result<u64> {
     len
 }
 
+/*
+ * IO Error Poisoning:
+ *
+ * Attempt 2:
+ *
+ * Return to using safe-on-the-surface Rust, but attempt to execute the reads
+ * via a separate thread, hoping that the observed poisoning goes away with the
+ * thread being closed and doesn't affect the main thread.
+ *
+ * May need `mpsc` to transfer data without spawning a thread on every read.
+ */
+
 pub fn load_input() -> anyhow::Result<File> {
     OpenOptions::new()
         .read(true)