Renamed test and added test for same crate

src/test/rustdoc/cross-crate-hidden-impl-parameter.rs

@@ -1,10 +1,10 @@
 // Issue #86448: test for cross-crate `doc(hidden)`
 #![crate_name = "foo"]
 
-// aux-build:cross-crate-hidden.rs
-extern crate cross_crate_hidden;
+// aux-build:cross-crate-hidden-impl-parameter.rs
+extern crate cross_crate_hidden_impl_parameter;
 
-pub use ::cross_crate_hidden::{HiddenType, HiddenTrait}; // OK, not re-exported
+pub use ::cross_crate_hidden_impl_parameter::{HiddenType, HiddenTrait}; // OK, not re-exported
 
 pub enum MyLibType {}
 

src/test/rustdoc/same-crate-hidden-impl-parameter.rs

@@ -0,0 +1,36 @@
+// test for `doc(hidden)` with impl parameters in the same crate.
+#![crate_name = "foo"]
+
+#[doc(hidden)]
+pub enum HiddenType {}
+
+#[doc(hidden)]
+pub trait HiddenTrait {}
+
+pub enum MyLibType {}
+
+// @!has foo/enum.MyLibType.html '//*[@id="impl-From%3CHiddenType%3E"]' 'impl From<HiddenType> for MyLibType'
+impl From<HiddenType> for MyLibType {
+    fn from(it: HiddenType) -> MyLibType {
+        match it {}
+    }
+}
+
+pub struct T<T>(T);
+
+// @!has foo/enum.MyLibType.html '//*[@id="impl-From%3CT%3CT%3CT%3CT%3CHiddenType%3E%3E%3E%3E%3E"]' 'impl From<T<T<T<T<HiddenType>>>>> for MyLibType'
+impl From<T<T<T<T<HiddenType>>>>> for MyLibType {
+    fn from(it: T<T<T<T<HiddenType>>>>) -> MyLibType {
+        todo!()
+    }
+}
+
+// @!has foo/enum.MyLibType.html '//*[@id="impl-HiddenTrait"]' 'impl HiddenTrait for MyLibType'
+impl HiddenTrait for MyLibType {}
+
+// @!has foo/struct.T.html '//*[@id="impl-From%3CMyLibType%3E"]' 'impl From<MyLibType> for T<T<T<T<HiddenType>>>>'
+impl From<MyLibType> for T<T<T<T<HiddenType>>>> {
+    fn from(it: MyLibType) -> T<T<T<T<HiddenType>>>> {
+        match it {}
+    }
+}