Add test raw-underscore-lifetime.rs

Signed-off-by: xizheyin <[email protected]>

Author: xizheyin

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() {}

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`.