Add regression test for #130233

Author: GuillaumeGomez

tests/rustdoc/intra-doc/filter-out-private.rs

@@ -0,0 +1,26 @@
+// This test ensures that private/hidden items don't create ambiguity.
+// This is a regression test for <https://github.com/rust-lang/rust/issues/130233>.
+
+#![deny(rustdoc::broken_intra_doc_links)]
+#![crate_name = "foo"]
+
+pub struct Thing {}
+
+#[doc(hidden)]
+#[allow(non_snake_case)]
+pub fn Thing() {}
+
+pub struct Bar {}
+
+#[allow(non_snake_case)]
+fn Bar() {}
+
+//@ has 'foo/fn.repro.html'
+//@ has - '//*[@class="toggle top-doc"]/*[@class="docblock"]//a/@href' 'struct.Thing.html'
+/// Do stuff with [`Thing`].
+pub fn repro(_: Thing) {}
+
+//@ has 'foo/fn.repro2.html'
+//@ has - '//*[@class="toggle top-doc"]/*[@class="docblock"]//a/@href' 'struct.Bar.html'
+/// Do stuff with [`Bar`].
+pub fn repro2(_: Bar) {}