Anastasia added inline comments.

================
Comment at: clang/tools/c-index-test/c-index-test.c:1695
+    CXType RT = clang_getResultType(T);
+    if (RT.kind != CXType_Invalid)
+      PrintSingleTypeSize(RT, " [resulttype=%s] [resulttypekind=%s]",
----------------
emilio wrote:
> Anastasia wrote:
> > Should it not return undeduced error in the other case?
> I'm not sure what you mean, can you clarify?
> 
> The undeduced error is only returned when you try to access the `Auto` type 
> which is the return value, not the function type, which has a known layout.
> 
> So in the error case, `T` here is the `auto Tie(void*) const;` type, and `RT` 
> is the undeduced `auto` type, which is what crashed.
> 
> We had no way to exercise this in `c-index-test`, so I changed it to exercise 
> this codepath too. I can add a `CHECK` for the error code if you want.
Yep, error check would be good since it's covers better changes in your patch.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D58569/new/

https://reviews.llvm.org/D58569



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