ahatanak added inline comments.

================
Comment at: lib/Sema/SemaExpr.cpp:7117
+    if (E && S.checkNonNullExpr(E))
+      return NullabilityKind::Nullable;
+
----------------
jordan_rose wrote:
> This isn't quite correct, unfortunately. `(_Nonnull id)nil` should be 
> considered non-nullable, since it's the canonical way to avoid all these 
> warnings. It might just be good enough to move this check below the 
> `getNullability` one, though.
Sema::CheckNonNullExpr checks the nullability of the type of the expression 
first and returns false if there is a cast to `_Nonnull`.


Repository:
  rC Clang

https://reviews.llvm.org/D22391



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