[gcc r15-8618] gccrs: collect-lang-items: Display attribute upon error finding it

[Arthur Cohen via Gcc-cvs]

https://gcc.gnu.org/g:20d4c59e248faf86d34c2525901951ee88163a66

commit r15-8618-g20d4c59e248faf86d34c2525901951ee88163a66
Author: Arthur Cohen <arthur.co...@embecosm.com>
Date:   Fri Jan 3 15:45:39 2025 +0000

    gccrs: collect-lang-items: Display attribute upon error finding it
    
    gcc/rust/ChangeLog:
    
            * ast/rust-collect-lang-items.cc (get_lang_item_attr): Show unknown 
attribute upon error.

Diff:
---
 gcc/rust/ast/rust-collect-lang-items.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/rust/ast/rust-collect-lang-items.cc 
b/gcc/rust/ast/rust-collect-lang-items.cc
index 50d134a429f5..168123ee56eb 100644
--- a/gcc/rust/ast/rust-collect-lang-items.cc
+++ b/gcc/rust/ast/rust-collect-lang-items.cc
@@ -36,7 +36,8 @@ get_lang_item_attr (const T &maybe_lang_item)
       const auto &str_path = attr.get_path ().as_string ();
       if (!Analysis::Attributes::is_known (str_path))
        {
-         rust_error_at (attr.get_locus (), "unknown attribute");
+         rust_error_at (attr.get_locus (), "unknown attribute %qs",
+                        str_path.c_str ());
          continue;
        }