From bc8093ed551546730194a2b726dbd39466d199d0 Mon Sep 17 00:00:00 2001
From: hyd-dev <yd-huang@outlook.com>
Date: Sat, 13 Mar 2021 18:50:43 +0800
Subject: [PATCH 1/2] Fix panic message of `assert_failed_inner`

---
 library/core/src/panicking.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/core/src/panicking.rs b/library/core/src/panicking.rs
index 12acf5b4329..3e3e96fcd7f 100644
--- a/library/core/src/panicking.rs
+++ b/library/core/src/panicking.rs
@@ -154,7 +154,7 @@ fn assert_failed_inner(
         Some(args) => panic!(
             r#"assertion failed: `(left {} right)`
   left: `{:?}`,
- right: `{:?}: {}`"#,
+ right: `{:?}`: {}"#,
             op, left, right, args
         ),
         None => panic!(

From 7ecb5d86014f4da127c3d17c4b9fea3b344e7cde Mon Sep 17 00:00:00 2001
From: hyd-dev <yd-huang@outlook.com>
Date: Sat, 13 Mar 2021 19:14:57 +0800
Subject: [PATCH 2/2] Add regression tests

---
 src/test/ui/macros/assert-eq-macro-msg.rs      |  9 +++++++++
 src/test/ui/macros/assert-matches-macro-msg.rs | 11 +++++++++++
 src/test/ui/macros/assert-ne-macro-msg.rs      |  9 +++++++++
 3 files changed, 29 insertions(+)
 create mode 100644 src/test/ui/macros/assert-eq-macro-msg.rs
 create mode 100644 src/test/ui/macros/assert-matches-macro-msg.rs
 create mode 100644 src/test/ui/macros/assert-ne-macro-msg.rs

diff --git a/src/test/ui/macros/assert-eq-macro-msg.rs b/src/test/ui/macros/assert-eq-macro-msg.rs
new file mode 100644
index 00000000000..accbd2d1e7f
--- /dev/null
+++ b/src/test/ui/macros/assert-eq-macro-msg.rs
@@ -0,0 +1,9 @@
+// run-fail
+// error-pattern:panicked at 'assertion failed: `(left == right)`
+// error-pattern: left: `2`
+// error-pattern:right: `3`: 1 + 1 definitely should be 3'
+// ignore-emscripten no processes
+
+fn main() {
+    assert_eq!(1 + 1, 3, "1 + 1 definitely should be 3");
+}
diff --git a/src/test/ui/macros/assert-matches-macro-msg.rs b/src/test/ui/macros/assert-matches-macro-msg.rs
new file mode 100644
index 00000000000..43be9532f5d
--- /dev/null
+++ b/src/test/ui/macros/assert-matches-macro-msg.rs
@@ -0,0 +1,11 @@
+// run-fail
+// error-pattern:panicked at 'assertion failed: `(left matches right)`
+// error-pattern: left: `2`
+// error-pattern:right: `3`: 1 + 1 definitely should be 3'
+// ignore-emscripten no processes
+
+#![feature(assert_matches)]
+
+fn main() {
+    assert_matches!(1 + 1, 3, "1 + 1 definitely should be 3");
+}
diff --git a/src/test/ui/macros/assert-ne-macro-msg.rs b/src/test/ui/macros/assert-ne-macro-msg.rs
new file mode 100644
index 00000000000..fc0472b99b4
--- /dev/null
+++ b/src/test/ui/macros/assert-ne-macro-msg.rs
@@ -0,0 +1,9 @@
+// run-fail
+// error-pattern:panicked at 'assertion failed: `(left != right)`
+// error-pattern: left: `2`
+// error-pattern:right: `2`: 1 + 1 definitely should not be 2'
+// ignore-emscripten no processes
+
+fn main() {
+    assert_ne!(1 + 1, 2, "1 + 1 definitely should not be 2");
+}