Add regression test for rust-lang#105735

Author: GuillaumeGomez

tests/rustdoc/issue-105735-overlapping-reexport.rs

@@ -0,0 +1,17 @@
+// Regression test to ensure that both `AtomicU8` items are displayed.
+
+#![crate_name = "foo"]
+
+// @has 'foo/index.html'
+// @has - '//*[@class="item-name"]/a[@class="struct"]' 'AtomicU8'
+// @has - '//*[@class="item-name"]/a[@class="constant"]' 'AtomicU8'
+// @has - '//*[@id="reexport.AtomicU8"]/code' 'pub use crate::thing::AtomicU8;'
+
+mod thing {
+    pub use std::sync::atomic::AtomicU8;
+
+    #[allow(non_upper_case_globals)]
+    pub const AtomicU8: () = ();
+}
+
+pub use crate::thing::AtomicU8;