[clang] [clang] [C++20] Defaulted operator== doesn't lookup in using-directive properly #97087 (PR #99542)

[Vlad Serebrennikov via cfe-commits]

================
@@ -4856,7 +4856,7 @@ bool 
TemplateDeclInstantiator::SubstDefaultedFunction(FunctionDecl *New,
                    : DFI);
   }
 
-  SemaRef.SetDeclDefaulted(New, Tmpl->getLocation());
+  SemaRef.SetDeclDefaulted(nullptr, New, Tmpl->getLocation());
----------------
Endilll wrote:

I did wonder if my new test (https://godbolt.org/z/hE3h4b4oM) with class 
template would fail on `nullptr`s in `SemaTemplateInstantiateDecl.cpp`, but I 
guess it doesn't. Could there be a scope that we should pass here, too?
CC @cor3ntin @mizvekov 

https://github.com/llvm/llvm-project/pull/99542
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