[gcc r15-8630] gccrs: derive(Clone): Mark PhantomData as a lang item

[Arthur Cohen via Gcc-cvs]

https://gcc.gnu.org/g:9bc5deb919ce4c33839fc331aa943c99c33adce6

commit r15-8630-g9bc5deb919ce4c33839fc331aa943c99c33adce6
Author: Arthur Cohen <arthur.co...@embecosm.com>
Date:   Thu Dec 26 10:57:07 2024 +0000

    gccrs: derive(Clone): Mark PhantomData as a lang item
    
    gcc/testsuite/ChangeLog:
    
            * rust/compile/derive_macro4.rs: Make PhantomData a lang item.

Diff:
---
 gcc/testsuite/rust/compile/derive_macro4.rs | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/gcc/testsuite/rust/compile/derive_macro4.rs 
b/gcc/testsuite/rust/compile/derive_macro4.rs
index 7802e8fd8000..b20043ba927b 100644
--- a/gcc/testsuite/rust/compile/derive_macro4.rs
+++ b/gcc/testsuite/rust/compile/derive_macro4.rs
@@ -6,12 +6,9 @@ pub trait Clone {
     fn clone(&self) -> Self;
 }
 
+#[lang = "phantom_data"]
 struct PhantomData<T>;
 
-pub struct AssertParamIsCopy<T: Copy> {
-    _field: PhantomData<T>,
-}
-
 #[derive(Clone)] // { dg-error "bounds not satisfied for U .Copy. is not 
satisfied" }
 union U {
     i: i32,