From cecf9ead40352f77e2e83765f0f6a796277299ec Mon Sep 17 00:00:00 2001
From: xizheyin <xizheyin@smail.nju.edu.cn>
Date: Tue, 1 Jul 2025 20:34:45 +0800
Subject: [PATCH] Add test raw-underscore-lifetime.rs

Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>
---
 .../raw-underscore-lifetime.rs                    | 10 ++++++++++
 .../raw-underscore-lifetime.stderr                | 15 +++++++++++++++
 2 files changed, 25 insertions(+)
 create mode 100644 tests/ui/underscore-lifetime/raw-underscore-lifetime.rs
 create mode 100644 tests/ui/underscore-lifetime/raw-underscore-lifetime.stderr

diff --git a/tests/ui/underscore-lifetime/raw-underscore-lifetime.rs b/tests/ui/underscore-lifetime/raw-underscore-lifetime.rs
new file mode 100644
index 000000000000..9ab040f2eab8
--- /dev/null
+++ b/tests/ui/underscore-lifetime/raw-underscore-lifetime.rs
@@ -0,0 +1,10 @@
+// This test is to ensure that the raw underscore lifetime won't emit two duplicate errors.
+// See issue #143152
+
+//@ edition: 2021
+
+fn f<'r#_>(){}
+//~^ ERROR `_` cannot be a raw lifetime
+//~| ERROR `'_` cannot be used here [E0637]
+
+fn main() {}
diff --git a/tests/ui/underscore-lifetime/raw-underscore-lifetime.stderr b/tests/ui/underscore-lifetime/raw-underscore-lifetime.stderr
new file mode 100644
index 000000000000..39627d8a4763
--- /dev/null
+++ b/tests/ui/underscore-lifetime/raw-underscore-lifetime.stderr
@@ -0,0 +1,15 @@
+error: `_` cannot be a raw lifetime
+  --> $DIR/raw-underscore-lifetime.rs:6:6
+   |
+LL | fn f<'r#_>(){}
+   |      ^^^^
+
+error[E0637]: `'_` cannot be used here
+  --> $DIR/raw-underscore-lifetime.rs:6:6
+   |
+LL | fn f<'r#_>(){}
+   |      ^^^^ `'_` is a reserved lifetime name
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0637`.