gccrs: lower: Always crash when lowering macro invocations

gcc/rust/ChangeLog:

	* hir/rust-ast-lower-base.cc (ASTLoweringBase::visit): Add base implementation
	for visitor.

diff --git a/gcc/rust/hir/rust-ast-lower-base.cc b/gcc/rust/hir/rust-ast-lower-base.cc
index add02747b0abe7ef9df748a2fcbc901f8901fd89..f38697cf316ccc09982344d021d5adf3bbc4430f 100644 (file)
--- a/gcc/rust/hir/rust-ast-lower-base.cc
+++ b/gcc/rust/hir/rust-ast-lower-base.cc
@@ -30,6 +30,14 @@
 namespace Rust {
 namespace HIR {
 
+// We special case lowering macro invocations as that should NEVER happen
+void
+ASTLoweringBase::visit (AST::MacroInvocation &invoc)
+{
+  rust_fatal_error (invoc.get_locus (), "rogue macro detected during lowering");
+  rust_unreachable ();
+}
+
 void
 ASTLoweringBase::visit (AST::Token &)
 {}
@@ -373,9 +381,6 @@ void
 ASTLoweringBase::visit (AST::MacroRulesDefinition &)
 {}
 void
-ASTLoweringBase::visit (AST::MacroInvocation &)
-{}
-void
 ASTLoweringBase::visit (AST::MetaItemPath &)
 {}
 void