1 files changed, 60 insertions, 7 deletions

diff --git a/vendor/itertools/benches/powerset.rs b/vendor/itertools/benches/powerset.rs
index 074550bc4..018333d31 100644
--- a/vendor/itertools/benches/powerset.rs
+++ b/vendor/itertools/benches/powerset.rs
@@ -20,17 +20,64 @@ fn powerset_n(c: &mut Criterion, n: usize) {
     });
 }
 
-fn powerset_0(c: &mut Criterion) { powerset_n(c, 0); }
+fn powerset_n_fold(c: &mut Criterion, n: usize) {
+    let id = format!("powerset {} fold", n);
+    c.bench_function(id.as_str(), move |b| {
+        b.iter(|| {
+            for _ in 0..calc_iters(n) {
+                (0..n).powerset().fold(0, |s, elt| s + black_box(elt).len());
+            }
+        })
+    });
+}
+
+fn powerset_0(c: &mut Criterion) {
+    powerset_n(c, 0);
+}
+
+fn powerset_1(c: &mut Criterion) {
+    powerset_n(c, 1);
+}
+
+fn powerset_2(c: &mut Criterion) {
+    powerset_n(c, 2);
+}
 
-fn powerset_1(c: &mut Criterion) { powerset_n(c, 1); }
+fn powerset_4(c: &mut Criterion) {
+    powerset_n(c, 4);
+}
 
-fn powerset_2(c: &mut Criterion) { powerset_n(c, 2); }
+fn powerset_8(c: &mut Criterion) {
+    powerset_n(c, 8);
+}
 
-fn powerset_4(c: &mut Criterion) { powerset_n(c, 4); }
+fn powerset_12(c: &mut Criterion) {
+    powerset_n(c, 12);
+}
 
-fn powerset_8(c: &mut Criterion) { powerset_n(c, 8); }
+fn powerset_0_fold(c: &mut Criterion) {
+    powerset_n_fold(c, 0);
+}
 
-fn powerset_12(c: &mut Criterion) { powerset_n(c, 12); }
+fn powerset_1_fold(c: &mut Criterion) {
+    powerset_n_fold(c, 1);
+}
+
+fn powerset_2_fold(c: &mut Criterion) {
+    powerset_n_fold(c, 2);
+}
+
+fn powerset_4_fold(c: &mut Criterion) {
+    powerset_n_fold(c, 4);
+}
+
+fn powerset_8_fold(c: &mut Criterion) {
+    powerset_n_fold(c, 8);
+}
+
+fn powerset_12_fold(c: &mut Criterion) {
+    powerset_n_fold(c, 12);
+}
 
 criterion_group!(
     benches,
@@ -40,5 +87,11 @@ criterion_group!(
     powerset_4,
     powerset_8,
     powerset_12,
+    powerset_0_fold,
+    powerset_1_fold,
+    powerset_2_fold,
+    powerset_4_fold,
+    powerset_8_fold,
+    powerset_12_fold,
 );
-criterion_main!(benches);
\ No newline at end of file
+criterion_main!(benches);