================
@@ -13639,12 +13639,21 @@ StmtResult 
TreeTransform<Derived>::TransformUnresolvedSYCLKernelCallStmt(
 
 template <typename Derived>
 ExprResult TreeTransform<Derived>::TransformCXXReflectExpr(CXXReflectExpr *E) {
-  // TODO(reflection): Implement its transform
-
   switch (E->getKind()) {
   case ReflectionKind::Type: {
-    TypeSourceInfo *NewT = getDerived().TransformType(
-        const_cast<TypeSourceInfo *>(E->getTypeSourceInfo()));
+    auto *TSI = const_cast<TypeSourceInfo *>(E->getTypeSourceInfo());
+    TypeSourceInfo *NewT;
+
+    // Rebuild the entire TypeLoc if this is an alias; for alias template
+    // specializations, what determines identity is the template arguments
+    // (and the identity of the alias declaration), not the canonical type.
----------------
ojhunt wrote:

Probably a dumb question: is clone cached (or even cacheable at all?)

https://github.com/llvm/llvm-project/pull/232074
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