# HG changeset patch
# User Yuya Nishihara <yuya@tcha.org>
# Date 2019-08-16 09:34:05
# Node ID 88d6a6f7e83716146fc725f20166509a520bc164
# Parent  2e9b29fa3e80f6d2056e74a0ec31786b4d6dadbb

rust-discovery: use while loop instead of match + break

This looks slightly nicer.

diff --git a/rust/hg-core/src/discovery.rs b/rust/hg-core/src/discovery.rs
--- a/rust/hg-core/src/discovery.rs
+++ b/rust/hg-core/src/discovery.rs
@@ -65,13 +65,7 @@ where
     let mut visit: VecDeque<Revision> = heads.into_iter().collect();
     let mut factor: u32 = 1;
     let mut seen: HashSet<Revision> = HashSet::new();
-    loop {
-        let current = match visit.pop_front() {
-            None => {
-                break;
-            }
-            Some(r) => r,
-        };
+    while let Some(current) = visit.pop_front() {
         if !seen.insert(current) {
             continue;
         }