TupleCombinations is not lazy but must be used nonetheless

Author: Philippe-Cholet

src/adaptors/mod.rs

@@ -612,7 +612,7 @@ where
 /// See [`.tuple_combinations()`](crate::Itertools::tuple_combinations) for more
 /// information.
 #[derive(Clone, Debug)]
-#[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
+#[must_use = "this iterator adaptor is not lazy but does nearly nothing unless consumed"]
 pub struct TupleCombinations<I, T>
 where
     I: Iterator,

tests/laziness.rs

@@ -196,10 +196,15 @@ must_use_tests! {
     while_some {
         let _ = Panicking.map(Some).while_some();
     }
-    #[ignore]
-    tuple_combinations {
+    tuple_combinations1 {
         let _ = Panicking.tuple_combinations::<(_,)>();
+    }
+    #[should_panic]
+    tuple_combinations2 {
         let _ = Panicking.tuple_combinations::<(_, _)>();
+    }
+    #[should_panic]
+    tuple_combinations3 {
         let _ = Panicking.tuple_combinations::<(_, _, _)>();
     }
     combinations {