[gcc/devel/rust/master] Add error emitting when we can't resolve id expr

[Thomas Schwinge via Gcc-cvs]

https://gcc.gnu.org/g:92874edab8f6a22c9c0f05eabd45be792c354a71

commit 92874edab8f6a22c9c0f05eabd45be792c354a71
Author: jjasmine <tanghocle...@gmail.com>
Date:   Fri Mar 1 05:31:15 2024 -0500

    Add error emitting when we can't resolve id expr
    
    gcc/rust/ChangeLog:
    
            * resolve/rust-late-name-resolver-2.0.cc (Late::visit): Add error 
emitting

Diff:
---
 gcc/rust/resolve/rust-late-name-resolver-2.0.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gcc/rust/resolve/rust-late-name-resolver-2.0.cc 
b/gcc/rust/resolve/rust-late-name-resolver-2.0.cc
index f9731a451a3a..8717c51e34ae 100644
--- a/gcc/rust/resolve/rust-late-name-resolver-2.0.cc
+++ b/gcc/rust/resolve/rust-late-name-resolver-2.0.cc
@@ -130,7 +130,10 @@ Late::visit (AST::IdentifierExpr &expr)
     resolved = label;
   else if (value)
     resolved = value;
-  // TODO: else emit error?
+  else {
+      rust_error_at(expr.get_locus (), "could not resolve identifier 
expression: %qs", expr.get_ident ().as_string ().c_str ());
+      return;
+  }
 
   ctx.map_usage (expr.get_node_id (), *resolved);