rustdoc: properly elide cross-crate host effect args

tests/rustdoc/const-effect-param.rs

@@ -1,3 +1,5 @@
+// Check that we don't render host effect parameters & arguments.
+
 #![crate_name = "foo"]
 #![feature(effects, const_trait_impl)]
 

tests/rustdoc/inline_cross/auxiliary/const-effect-param.rs

@@ -0,0 +1,16 @@
+#![feature(effects, const_trait_impl)]
+
+#[const_trait]
+pub trait Resource {}
+
+pub const fn load<R: ~const Resource>() -> i32 {
+    0
+}
+
+pub const fn lock<R: Resource>() {}
+
+#[allow(non_upper_case_globals)]
+pub trait Clash<const host: u64> {}
+
+#[allow(non_upper_case_globals)]
+pub const fn clash<T: Clash<host>, const host: u64>() {}

tests/rustdoc/inline_cross/auxiliary/const-fn.rs

@@ -1,5 +0,0 @@
-#![feature(effects)]
-
-pub const fn load() -> i32 {
-    0
-}

tests/rustdoc/inline_cross/const-effect-param.rs

@@ -0,0 +1,29 @@
+// Regression test for issue #116629.
+// Check that we don't render host effect parameters & arguments.
+
+// aux-crate:const_effect_param=const-effect-param.rs
+// edition: 2021
+#![crate_name = "user"]
+
+// Don't render the host param on `load` and the host arg `host` passed to `Resource`.
+// @has user/fn.load.html
+// @has - '//pre[@class="rust item-decl"]' "pub const fn load<R>() -> i32\
+//     where \
+//         R: Resource"
+pub use const_effect_param::load;
+
+// Don't render the host arg `true` passed to `Resource`.
+// @has user/fn.lock.html
+// @has - '//pre[@class="rust item-decl"]' "pub const fn lock<R>()\
+//     where \
+//         R: Resource"
+pub use const_effect_param::lock;
+
+// Regression test for an issue introduced in PR #116670.
+// Don't hide the const param `host` since it actually isn't the host effect param.
+// @has user/fn.clash.html
+// @has - '//pre[@class="rust item-decl"]' \
+//    "pub const fn clash<T, const host: u64>()\
+//     where \
+//         T: Clash<host>"
+pub use const_effect_param::clash;

tests/rustdoc/inline_cross/const-fn.rs

@@ -1,10 +0,0 @@
-// Regression test for issue #116629.
-// Check that we render the correct generic params of const fn
-
-// aux-crate:const_fn=const-fn.rs
-// edition: 2021
-#![crate_name = "user"]
-
-// @has user/fn.load.html
-// @has - '//pre[@class="rust item-decl"]' "pub const fn load() -> i32"
-pub use const_fn::load;