From a891139df1f7b3c8c4a07b3d6ca79a459d6d81d1 Mon Sep 17 00:00:00 2001
From: Vadim Petrochenkov <vadim.petrochenkov@gmail.com>
Date: Fri, 14 Mar 2025 17:18:41 +0300
Subject: resolve: Avoid some unstable iteration

---
 compiler/rustc_data_structures/src/unord.rs | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'compiler/rustc_data_structures')

diff --git a/compiler/rustc_data_structures/src/unord.rs b/compiler/rustc_data_structures/src/unord.rs
index 34895d3efe6..90a77e1e580 100644
--- a/compiler/rustc_data_structures/src/unord.rs
+++ b/compiler/rustc_data_structures/src/unord.rs
@@ -259,6 +259,12 @@ impl<V: Eq + Hash> UnordSet<V> {
         self.inner.is_empty()
     }
 
+    /// If the set has only one element, returns it, otherwise returns `None`.
+    #[inline]
+    pub fn get_only(&self) -> Option<&V> {
+        if self.inner.len() == 1 { self.inner.iter().next() } else { None }
+    }
+
     #[inline]
     pub fn insert(&mut self, v: V) -> bool {
         self.inner.insert(v)
-- 
cgit 1.4.1-3-g733a5