Add tests for macros hygiene

Author: SkiFire13

tests/macros_hygiene.rs

@@ -0,0 +1,13 @@
+#[test]
+fn iproduct_hygiene() {
+    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);
+}