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.philip@googlemail.com>

diff --git a/gcc/rust/backend/rust-compile-resolve-path.cc b/gcc/rust/backend/rust-compile-resolve-path.cc
index a80484acf097d4a6e5d163efa0da4abc5e602630..6d92c0cd1021974bb17ee19dd5f1586b35b20355 100644 (file)
--- 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