add regression test for #90781

Author: lolbinarycat

Diff for: tests/rustdoc/hidden-implementors-90781.rs

@@ -0,0 +1,78 @@
+//@ compile-flags: -Z unstable-options --document-hidden-items --document-private-items
+
+// regression test for https://github.com/rust-lang/rust/issues/90781
+#![crate_name = "foo"]
+
+//@ has foo/trait.TPubVis.html
+//@ has - '//*[@id="implementors-list"]' 'HidPriv'
+//@ has - '//*[@id="implementors-list"]' 'HidPub'
+//@ has - '//*[@id="implementors-list"]' 'VisPriv'
+//@ has - '//*[@id="implementors-list"]' 'VisPub'
+pub trait TPubVis {}
+
+//@ has foo/trait.TPubHidden.html
+//@ has - '//*[@id="implementors-list"]' 'HidPriv'
+//@ has - '//*[@id="implementors-list"]' 'HidPub'
+//@ has - '//*[@id="implementors-list"]' 'VisPriv'
+//@ has - '//*[@id="implementors-list"]' 'VisPub'
+#[doc(hidden)]
+pub trait TPubHidden {}
+
+//@ has foo/trait.TPrivVis.html
+//@ has - '//*[@id="implementors-list"]' 'HidPriv'
+//@ has - '//*[@id="implementors-list"]' 'HidPub'
+//@ has - '//*[@id="implementors-list"]' 'VisPriv'
+//@ has - '//*[@id="implementors-list"]' 'VisPub'
+trait TPrivVis {}
+
+#[doc(hidden)]
+//@ has foo/trait.TPrivHidden.html
+//@ has - '//*[@id="impl-TPrivHidden-for-HidPriv"]' 'HidPriv'
+//@ has - '//*[@id="impl-TPrivHidden-for-HidPub"]' 'HidPub'
+//@ has - '//*[@id="impl-TPrivHidden-for-VisPriv"]' 'VisPriv'
+//@ has - '//*[@id="impl-TPrivHidden-for-VisPub"]' 'VisPub'
+trait TPrivHidden {}
+
+//@ has foo/struct.VisPub.html
+//@ has - '//*[@id="trait-implementations-list"]' 'TPrivHidden'
+//@ has - '//*[@id="trait-implementations-list"]' 'TPrivVis'
+//@ has - '//*[@id="trait-implementations-list"]' 'TPubHidden'
+//@ has - '//*[@id="trait-implementations-list"]' 'TPubVis'
+pub struct VisPub;
+
+//@ has foo/struct.VisPriv.html
+//@ has - '//*[@id="trait-implementations-list"]' 'TPrivHidden'
+//@ has - '//*[@id="trait-implementations-list"]' 'TPrivVis'
+//@ has - '//*[@id="trait-implementations-list"]' 'TPubHidden'
+//@ has - '//*[@id="trait-implementations-list"]' 'TPubVis'
+struct VisPriv;
+
+//@ has foo/struct.HidPub.html
+//@ has - '//*[@id="trait-implementations-list"]' 'TPrivHidden'
+//@ has - '//*[@id="trait-implementations-list"]' 'TPrivVis'
+//@ has - '//*[@id="trait-implementations-list"]' 'TPubHidden'
+//@ has - '//*[@id="trait-implementations-list"]' 'TPubVis'
+#[doc(hidden)]
+pub struct HidPub;
+
+//@ has foo/struct.HidPriv.html
+//@ has - '//*[@id="trait-implementations-list"]' 'TPrivHidden'
+//@ has - '//*[@id="trait-implementations-list"]' 'TPrivVis'
+//@ has - '//*[@id="trait-implementations-list"]' 'TPubHidden'
+//@ has - '//*[@id="trait-implementations-list"]' 'TPubVis'
+#[doc(hidden)]
+struct HidPriv;
+
+macro_rules! implement {
+    ($trait:ident - $($struct:ident)+) => {
+        $(
+            impl $trait for $struct {}
+        )+
+    }
+}
+
+
+implement!(TPubVis - VisPub VisPriv HidPub HidPriv);
+implement!(TPubHidden - VisPub VisPriv HidPub HidPriv);
+implement!(TPrivVis - VisPub VisPriv HidPub HidPriv);
+implement!(TPrivHidden - VisPub VisPriv HidPub HidPriv);