[gcc/devel/rust/master] Add box definition to avoid error

[Thomas Schwinge via Gcc-cvs]

https://gcc.gnu.org/g:90a8ae7cca0d8bd6be09ac220350700c08a15c27

commit 90a8ae7cca0d8bd6be09ac220350700c08a15c27
Author: Pierre-Emmanuel Patry <pierre-emmanuel.pa...@embecosm.com>
Date:   Thu Sep 26 22:59:48 2024 +0200

    Add box definition to avoid error
    
    Box definition is part of the standard library and cannot be found during
    name resolution. This simple definition prevent any error from being
    emitted.
    
    gcc/testsuite/ChangeLog:
    
            * rust/compile/box_syntax_feature_gate.rs: Add box land item
            definition.
    
    Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.pa...@embecosm.com>

Diff:
---
 gcc/testsuite/rust/compile/box_syntax_feature_gate.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/testsuite/rust/compile/box_syntax_feature_gate.rs 
b/gcc/testsuite/rust/compile/box_syntax_feature_gate.rs
index 8eb5503dde6c..5f62a59a04bf 100644
--- a/gcc/testsuite/rust/compile/box_syntax_feature_gate.rs
+++ b/gcc/testsuite/rust/compile/box_syntax_feature_gate.rs
@@ -1,4 +1,6 @@
 // { dg-options "-frust-compile-until=lowering" }
+#[lang = "owned_box"]
+pub struct Box<T>;
 
 fn main() {
     let x: Box<_> = box 1; //{ dg-error "box expression syntax is 
experimental." "" { target *-*-* }  }