From 20431706a863f92cb37dc512fef6e48d192aaf2c Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:11:38 +0200
Subject: Merging upstream version 1.66.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 compiler/rustc_data_structures/src/transitive_relation.rs | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

(limited to 'compiler/rustc_data_structures/src/transitive_relation.rs')

diff --git a/compiler/rustc_data_structures/src/transitive_relation.rs b/compiler/rustc_data_structures/src/transitive_relation.rs
index f016c391f..cf6162038 100644
--- a/compiler/rustc_data_structures/src/transitive_relation.rs
+++ b/compiler/rustc_data_structures/src/transitive_relation.rs
@@ -1,5 +1,5 @@
 use crate::frozen::Frozen;
-use crate::fx::FxIndexSet;
+use crate::fx::{FxHashSet, FxIndexSet};
 use rustc_index::bit_set::BitMatrix;
 use std::fmt::Debug;
 use std::hash::Hash;
@@ -16,7 +16,7 @@ pub struct TransitiveRelationBuilder<T> {
 
     // List of base edges in the graph. Require to compute transitive
     // closure.
-    edges: Vec<Edge>,
+    edges: FxHashSet<Edge>,
 }
 
 #[derive(Debug)]
@@ -52,10 +52,10 @@ impl<T: Eq + Hash> Default for TransitiveRelationBuilder<T> {
     }
 }
 
-#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Debug)]
+#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Debug, Hash)]
 struct Index(usize);
 
-#[derive(Clone, PartialEq, Eq, Debug)]
+#[derive(Clone, PartialEq, Eq, Debug, Hash)]
 struct Edge {
     source: Index,
     target: Index,
@@ -99,9 +99,7 @@ impl<T: Eq + Hash + Copy> TransitiveRelationBuilder<T> {
         let a = self.add_index(a);
         let b = self.add_index(b);
         let edge = Edge { source: a, target: b };
-        if !self.edges.contains(&edge) {
-            self.edges.push(edge);
-        }
+        self.edges.insert(edge);
     }
 
     /// Compute the transitive closure derived from the edges, and converted to
-- 
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