Vendor things

third-party/vendor/crossbeam-channel/examples/fibonacci.rs

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+//! An asynchronous fibonacci sequence generator.
+
+use std::thread;
+
+use crossbeam_channel::{bounded, Sender};
+
+// Sends the Fibonacci sequence into the channel until it becomes disconnected.
+fn fibonacci(sender: Sender<u64>) {
+    let (mut x, mut y) = (0, 1);
+    while sender.send(x).is_ok() {
+        let tmp = x;
+        x = y;
+        y += tmp;
+    }
+}
+
+fn main() {
+    let (s, r) = bounded(0);
+    thread::spawn(|| fibonacci(s));
+
+    // Print the first 20 Fibonacci numbers.
+    for num in r.iter().take(20) {
+        println!("{}", num);
+    }
+}