1 files changed, 3 insertions, 0 deletions
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index e76a8b6da0f..d628b9898a9 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -3036,6 +3036,9 @@ ExprResult Sema::BuildDeclarationNameExpr(
       break;
     }
 
+    case Decl::CXXDeductionGuide:
+      llvm_unreachable("building reference to deduction guide");
+
     case Decl::MSProperty:
       valueKind = VK_LValue;
       break;