Add regression tests for rust-lang#130233

Author: GuillaumeGomez

tests/rustdoc-ui/intra-doc/filter-out-private-2.rs

@@ -0,0 +1,15 @@
+// This test ensures that ambiguities (not) resolved at a later stage still emit an error.
+
+#![deny(rustdoc::broken_intra_doc_links)]
+#![crate_name = "foo"]
+
+#[doc(hidden)]
+pub struct Thing {}
+
+#[allow(non_snake_case)]
+#[doc(hidden)]
+pub fn Thing() {}
+
+/// Do stuff with [`Thing`].
+//~^ ERROR all items matching `Thing` are either private or doc(hidden)
+pub fn repro(_: Thing) {}

tests/rustdoc-ui/intra-doc/filter-out-private-2.stderr

@@ -0,0 +1,14 @@
+error: all items matching `Thing` are either private or doc(hidden)
+  --> $DIR/filter-out-private-2.rs:13:21
+   |
+LL | /// Do stuff with [`Thing`].
+   |                     ^^^^^ unresolved link
+   |
+note: the lint level is defined here
+  --> $DIR/filter-out-private-2.rs:3:9
+   |
+LL | #![deny(rustdoc::broken_intra_doc_links)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 1 previous error
+

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

@@ -0,0 +1,13 @@
+// This test ensures that ambiguities resolved at a later stage still emit an error.
+
+#![deny(rustdoc::broken_intra_doc_links)]
+#![crate_name = "foo"]
+
+pub struct Thing {}
+
+#[allow(non_snake_case)]
+pub fn Thing() {}
+
+/// Do stuff with [`Thing`].
+//~^ ERROR `Thing` is both a function and a struct
+pub fn repro(_: Thing) {}

tests/rustdoc-ui/intra-doc/filter-out-private.stderr

@@ -0,0 +1,22 @@
+error: `Thing` is both a function and a struct
+  --> $DIR/filter-out-private.rs:11:21
+   |
+LL | /// Do stuff with [`Thing`].
+   |                     ^^^^^ ambiguous link
+   |
+note: the lint level is defined here
+  --> $DIR/filter-out-private.rs:3:9
+   |
+LL | #![deny(rustdoc::broken_intra_doc_links)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+help: to link to the function, add parentheses
+   |
+LL | /// Do stuff with [`Thing()`].
+   |                          ++
+help: to link to the struct, prefix with `struct@`
+   |
+LL | /// Do stuff with [`struct@Thing`].
+   |                     +++++++
+
+error: aborting due to 1 previous error
+

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) {}