[clang] create class-type injected NTTP with correct value kind (#101395)

A template parameter object is an lvalue, which was not being respected
for injected parameters.

Fixes #101394

1 files changed, 5 insertions, 4 deletions

diff --git a/clang/lib/AST/ExprClassification.cpp b/clang/lib/AST/ExprClassification.cpp
index 8c5613d..1f1b8ab 100644
--- a/clang/lib/AST/ExprClassification.cpp
+++ b/clang/lib/AST/ExprClassification.cpp
@@ -485,12 +485,13 @@ static Cl::Kinds ClassifyInternal(ASTContext &Ctx, const Expr *E) {
 /// ClassifyDecl - Return the classification of an expression referencing the
 /// given declaration.
 static Cl::Kinds ClassifyDecl(ASTContext &Ctx, const Decl *D) {
-  // C++ [expr.prim.general]p6: The result is an lvalue if the entity is a
-  //   function, variable, or data member and a prvalue otherwise.
+  // C++ [expr.prim.id.unqual]p3: The result is an lvalue if the entity is a
+  // function, variable, or data member, or a template parameter object and a
+  // prvalue otherwise.
   // In C, functions are not lvalues.
   // In addition, NonTypeTemplateParmDecl derives from VarDecl but isn't an
-  // lvalue unless it's a reference type (C++ [temp.param]p6), so we need to
-  // special-case this.
+  // lvalue unless it's a reference type or a class type (C++ [temp.param]p8),
+  // so we need to special-case this.
 
   if (const auto *M = dyn_cast<CXXMethodDecl>(D)) {
     if (M->isImplicitObjectMemberFunction())