Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

vendor/rayon/tests/issue671-unzip.rs

@@ -0,0 +1,17 @@
+#![type_length_limit = "10000"]
+
+use rayon::prelude::*;
+
+#[test]
+fn type_length_limit() {
+    let input = vec![1, 2, 3, 4, 5];
+    let (indexes, (squares, cubes)): (Vec<_>, (Vec<_>, Vec<_>)) = input
+        .par_iter()
+        .map(|x| (x * x, x * x * x))
+        .enumerate()
+        .unzip();
+
+    drop(indexes);
+    drop(squares);
+    drop(cubes);
+}