From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:02:58 +0200
Subject: Adding upstream version 1.64.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../rustc_data_structures/src/graph/reference.rs   | 39 ++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 compiler/rustc_data_structures/src/graph/reference.rs

(limited to 'compiler/rustc_data_structures/src/graph/reference.rs')

diff --git a/compiler/rustc_data_structures/src/graph/reference.rs b/compiler/rustc_data_structures/src/graph/reference.rs
new file mode 100644
index 000000000..c259fe56c
--- /dev/null
+++ b/compiler/rustc_data_structures/src/graph/reference.rs
@@ -0,0 +1,39 @@
+use super::*;
+
+impl<'graph, G: DirectedGraph> DirectedGraph for &'graph G {
+    type Node = G::Node;
+}
+
+impl<'graph, G: WithNumNodes> WithNumNodes for &'graph G {
+    fn num_nodes(&self) -> usize {
+        (**self).num_nodes()
+    }
+}
+
+impl<'graph, G: WithStartNode> WithStartNode for &'graph G {
+    fn start_node(&self) -> Self::Node {
+        (**self).start_node()
+    }
+}
+
+impl<'graph, G: WithSuccessors> WithSuccessors for &'graph G {
+    fn successors(&self, node: Self::Node) -> <Self as GraphSuccessors<'_>>::Iter {
+        (**self).successors(node)
+    }
+}
+
+impl<'graph, G: WithPredecessors> WithPredecessors for &'graph G {
+    fn predecessors(&self, node: Self::Node) -> <Self as GraphPredecessors<'_>>::Iter {
+        (**self).predecessors(node)
+    }
+}
+
+impl<'iter, 'graph, G: WithPredecessors> GraphPredecessors<'iter> for &'graph G {
+    type Item = G::Node;
+    type Iter = <G as GraphPredecessors<'iter>>::Iter;
+}
+
+impl<'iter, 'graph, G: WithSuccessors> GraphSuccessors<'iter> for &'graph G {
+    type Item = G::Node;
+    type Iter = <G as GraphSuccessors<'iter>>::Iter;
+}
-- 
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