# HG changeset patch
# User Yuya Nishihara <yuya@tcha.org>
# Date 2018-12-18 13:12:16
# Node ID 247f51cfc66820eaf48a495729c52a4e21a527ca
# Parent  86f0ed7ac6886f978eee3835d2efe4b7fb2f0d8a

rust: use .rev() for reverse range

Differential Revision: https://phab.mercurial-scm.org/D5450

diff --git a/rust/hg-core/src/ancestors.rs b/rust/hg-core/src/ancestors.rs
--- a/rust/hg-core/src/ancestors.rs
+++ b/rust/hg-core/src/ancestors.rs
@@ -321,7 +321,7 @@ impl<G: Graph> MissingAncestors<G> {
 
         // TODO heuristics for with_capacity()?
         let mut missing: Vec<Revision> = Vec::new();
-        for curr in (0..=start).map(|i| start - i) {
+        for curr in (0..=start).rev() {
             if revs_visit.is_empty() {
                 break;
             }