From e9fed696b5ae033195e2ec2f9ba1edf2c3dae5c5 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Thu, 21 May 2020 17:05:13 -0700
Subject: [PATCH] Impl Ord for proc_macro::LineColumn

---
 src/libproc_macro/lib.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/libproc_macro/lib.rs b/src/libproc_macro/lib.rs
index f11401b5a0c..2d5bd7e872b 100644
--- a/src/libproc_macro/lib.rs
+++ b/src/libproc_macro/lib.rs
@@ -39,6 +39,7 @@ mod diagnostic;
 #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
 pub use diagnostic::{Diagnostic, Level, MultiSpan};
 
+use std::cmp::Ordering;
 use std::ops::{Bound, RangeBounds};
 use std::path::PathBuf;
 use std::str::FromStr;
@@ -420,6 +421,20 @@ impl !Send for LineColumn {}
 #[unstable(feature = "proc_macro_span", issue = "54725")]
 impl !Sync for LineColumn {}
 
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+impl Ord for LineColumn {
+    fn cmp(&self, other: &Self) -> Ordering {
+        self.line.cmp(&other.line).then(self.column.cmp(&other.column))
+    }
+}
+
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+impl PartialOrd for LineColumn {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
 /// The source file of a given `Span`.
 #[unstable(feature = "proc_macro_span", issue = "54725")]
 #[derive(Clone)]