[gcc r16-2988] gccrs: Fix ICE for ast dump of deferred anon const

[Arthur Cohen via Gcc-cvs]

https://gcc.gnu.org/g:7f0fed0bfea5ea401d99f8afd4ce9b159aaf9381

commit r16-2988-g7f0fed0bfea5ea401d99f8afd4ce9b159aaf9381
Author: Philip Herron <herron.phi...@googlemail.com>
Date:   Thu Jul 31 21:16:36 2025 +0100

    gccrs: Fix ICE for ast dump of deferred anon const
    
    gcc/rust/ChangeLog:
    
            * ast/rust-ast-collector.cc (TokenCollector::visit): check for value
    
    Signed-off-by: Philip Herron <herron.phi...@googlemail.com>

Diff:
---
 gcc/rust/ast/rust-ast-collector.cc | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/gcc/rust/ast/rust-ast-collector.cc 
b/gcc/rust/ast/rust-ast-collector.cc
index f4033ad4aaef..b27a3af11e80 100644
--- a/gcc/rust/ast/rust-ast-collector.cc
+++ b/gcc/rust/ast/rust-ast-collector.cc
@@ -1274,7 +1274,13 @@ TokenCollector::visit (BlockExpr &expr)
 void
 TokenCollector::visit (AnonConst &expr)
 {
-  visit (expr.get_inner_expr ());
+  if (!expr.is_deferred ())
+    {
+      visit (expr.get_inner_expr ());
+      return;
+    }
+
+  push (Rust::Token::make_string (expr.get_locus (), "_"));
 }
 
 void