Auto merge of #145020 - GuillaumeGomez:rollup-5prs9kw, r=GuillaumeGomez

Rollup of 15 pull requests

Successful merges:

 - rust-lang/rust#144195 (Parser: Recover from attributes applied to types and generic args)
 - rust-lang/rust#144794 (Port `#[coroutine]` to the new attribute system)
 - rust-lang/rust#144835 (Anonymize binders in tail call sig)
 - rust-lang/rust#144861 (Stabilize `panic_payload_as_str` feature)
 - rust-lang/rust#144917 (Enforce tail call type is related to body return type in borrowck)
 - rust-lang/rust#144948 (we only merge candidates for trait and normalizes-to goals)
 - rust-lang/rust#144956 (Gate const trait syntax)
 - rust-lang/rust#144970 (rustdoc: fix caching of intra-doc links on reexports)
 - rust-lang/rust#144972 (add code example showing that file_prefix treats dotfiles as the name of a file, not an extension)
 - rust-lang/rust#144975 (`File::set_times`: Update documentation and example to support setting timestamps on directories)
 - rust-lang/rust#144977 (Fortify generic param default checks)
 - rust-lang/rust#144996 (simplifycfg: Mark as changed when start is modified in collapse goto chain)
 - rust-lang/rust#144998 (mir: Do not modify NonUse in `super_projection_elem`)
 - rust-lang/rust#145000 (Remove unneeded `stage` parameter when setting up stdlib Cargo)
 - rust-lang/rust#145008 (Fix rustdoc scrape examples crash)

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 9 insertions, 1 deletions

diff --git a/tests/ui/generics/generic-extern.rs b/tests/ui/generics/generic-extern.rs
index 36fa5eaafd6..b4f00fc1187 100644
--- a/tests/ui/generics/generic-extern.rs
+++ b/tests/ui/generics/generic-extern.rs
@@ -1,7 +1,15 @@
+// Ensure that we reject generic parameters on foreign items.
+
 extern "C" {
     fn foo<T>(); //~ ERROR foreign items may not have type parameters
+
+    // Furthermore, check that type parameter defaults lead to a *hard* error,
+    // not just a lint error, for maximum forward compatibility.
+    #[allow(invalid_type_param_default)] // Should have no effect here.
+    fn bar<T = ()>(); //~ ERROR foreign items may not have type parameters
+    //~^ ERROR defaults for generic parameters are not allowed here
 }
 
 fn main() {
-    foo::<i32>(); //~ ERROR requires unsafe
+    unsafe { foo::<i32>() };
 }