Consistent use of `impl Trait` arguments in the test's helper function.

diff --git a/library/alloc/tests/slice.rs b/library/alloc/tests/slice.rs
index 4211cd42b02e20f03953bf5afbb892bba0545031..198f467eea3528a0c5def7d4d01456fd5a1ff67a 100644 (file)
--- a/library/alloc/tests/slice.rs
+++ b/library/alloc/tests/slice.rs
@@ -1001,11 +1001,7 @@ enum Bounds {
         Lower,
         Upper,
     }
-    fn assert_precise_size_hints<I: Iterator>(
-        mut it: I,
-        which: Bounds,
-        context: impl fmt::Display,
-    ) {
+    fn assert_precise_size_hints(mut it: impl Iterator, which: Bounds, context: impl fmt::Display) {
         match which {
             Bounds::Lower => {
                 let mut lower_bounds = vec![it.size_hint().0];