[gcc r16-2944] gccrs: return error node when this fails during constexpr case

[Arthur Cohen via Gcc-cvs]

https://gcc.gnu.org/g:1490b80bd143b8808678e9449b070d5f18ac588c

commit r16-2944-g1490b80bd143b8808678e9449b070d5f18ac588c
Author: Philip Herron <herron.phi...@googlemail.com>
Date:   Fri Jul 18 16:44:36 2025 +0100

    gccrs: return error node when this fails during constexpr case
    
    Not adding the test case here we emit more errors than rustc for the error
    type node so its just noisy and dejagnu is being a pain.
    
    Fixes Rust-GCC#3933
    
    gcc/rust/ChangeLog:
    
            * backend/rust-compile-resolve-path.cc (ResolvePathRef::resolve): 
return error_mark_node
    
    Signed-off-by: Philip Herron <herron.phi...@googlemail.com>

Diff:
---
 gcc/rust/backend/rust-compile-resolve-path.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/rust/backend/rust-compile-resolve-path.cc 
b/gcc/rust/backend/rust-compile-resolve-path.cc
index a80484acf097..6d92c0cd1021 100644
--- a/gcc/rust/backend/rust-compile-resolve-path.cc
+++ b/gcc/rust/backend/rust-compile-resolve-path.cc
@@ -214,7 +214,8 @@ ResolvePathRef::resolve (const HIR::PathIdentSegment 
&final_segment,
 {
   TyTy::BaseType *lookup = nullptr;
   bool ok = ctx->get_tyctx ()->lookup_type (mappings.get_hirid (), &lookup);
-  rust_assert (ok);
+  if (!ok)
+    return error_mark_node;
 
   // need to look up the reference for this identifier