a.sidorin marked 5 inline comments as done.
a.sidorin added a comment.

Thank you for your comments! And sorry for late response after pinging.


================
Comment at: lib/AST/ASTImporter.cpp:2518-2519
@@ +2517,4 @@
+        Importer.Import(D->getMessage()));
+  if (!Message)
+    return nullptr;
+
----------------
sepavloff wrote:
> Since C++17 `static_assert` may be used without message, so null pointer here 
> is not an error.
I will modify the check, but may be we should check the language standard as 
well?

================
Comment at: lib/AST/ASTImporter.cpp:3363
@@ +3362,3 @@
+
+  // Determine whether we've already imported this decl.
+  // FriendDecl is not a NamedDecl so we cannot use localUncachedLookup.
----------------
sepavloff wrote:
> Maybe it is more natural to put this check into `bool 
> IsStructurallyEquivalent(StructuralEquivalenceContext &Context, RecordDecl 
> *D1, RecordDecl *D2)`? If records are equivalent, existing decl can be used 
> as a result of import, if not - entire record must be recreated anyway.
Sorry, it seems like I don't completely understand your idea. Won't 
`IsStructurallyEquivalent()` do an additional amount of work?


http://reviews.llvm.org/D14326



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