Add regression test for #108281

Author: GuillaumeGomez

tests/rustdoc/issue-108281.rs

@@ -0,0 +1,25 @@
+// Regression test for <https://github.com/rust-lang/rust/issues/108281>.
+// It ensures that the attributes on the first reexport are not duplicated.
+
+#![crate_name = "foo"]
+
+// @has 'foo/index.html'
+
+#[doc(hidden)]
+pub fn bar() {}
+mod sub {
+    pub fn public() {}
+}
+
+// @matches - '//*[@class="desc docblock-short"]' '^Displayed$'
+/// Displayed
+#[doc(inline)]
+pub use crate::bar as Bar;
+// @matches - '//*[@class="desc docblock-short"]' '^Hello\sDisplayed$'
+#[doc(inline)]
+/// Hello
+pub use crate::Bar as Bar2;
+
+// @matches - '//*[@class="desc docblock-short"]' '^Public$'
+/// Public
+pub use crate::sub::public as Public;