Vendor dependencies for 0.3.0 release

vendor/itertools/tests/macros_hygiene.rs

@@ -0,0 +1,27 @@
+mod alloc {}
+mod core {}
+mod either {}
+mod std {}
+
+#[test]
+fn iproduct_hygiene() {
+    let _ = itertools::iproduct!();
+    let _ = itertools::iproduct!(0..6);
+    let _ = itertools::iproduct!(0..6, 0..9);
+    let _ = itertools::iproduct!(0..6, 0..9, 0..12);
+}
+
+#[test]
+fn izip_hygiene() {
+    let _ = itertools::izip!(0..6);
+    let _ = itertools::izip!(0..6, 0..9);
+    let _ = itertools::izip!(0..6, 0..9, 0..12);
+}
+
+#[test]
+fn chain_hygiene() {
+    let _: ::std::iter::Empty<i32> = itertools::chain!();
+    let _ = itertools::chain!(0..6);
+    let _ = itertools::chain!(0..6, 0..9);
+    let _ = itertools::chain!(0..6, 0..9, 0..12);
+}