[tor-commits] [tor/master] [rust] Avoid a clone in contract_protocol_list()

[nickm at torproject.org]

commit 69502942b00ecc944437894b40b286cbfa3df928
Author: Nick Mathewson <nickm at torproject.org>
Date:   Fri Oct 27 13:02:14 2017 -0400

    [rust] Avoid a clone in contract_protocol_list()
---
 src/rust/protover/protover.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/rust/protover/protover.rs b/src/rust/protover/protover.rs
index 11e9d0079..f19f7972f 100644
--- a/src/rust/protover/protover.rs
+++ b/src/rust/protover/protover.rs
@@ -429,8 +429,9 @@ fn find_range(list: &Vec<u32>) -> (bool, u32) {
 /// A `String` representation of this set in ascending order.
 ///
 fn contract_protocol_list<'a>(supported_set: &'a HashSet<u32>) -> String {
-    let mut supported_clone = supported_set.clone();
-    let mut supported: Vec<u32> = supported_clone.drain().collect();
+    let mut supported: Vec<u32> = supported_set.iter()
+                                               .map(|x| *x)
+                                               .collect();
     supported.sort();
 
     let mut final_output: Vec<String> = Vec::new();