================
@@ -1411,3 +1414,35 @@ clang::Decl *
 ClangASTImporter::ASTImporterDelegate::GetOriginalDecl(clang::Decl *To) {
   return m_main.GetDeclOrigin(To).decl;
 }
+
+void ClangASTImporter::ASTImporterDelegate::UpdateImportProgress(
----------------
labath wrote:

> cast nullptr to a NamedDecl (which will give you nullptr) 

Actually, `dyn_cast` will abort if it gets a null pointer (`dyn_cast_or_null` 
is the version that forwards nullness) -- which makes this assert unnecessary. 
However, I think this is a very good example of an `assert` -- checking for 
things that "should not happen" without introducing overhead in the production 
codepath.

https://github.com/llvm/llvm-project/pull/91452
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