[PATCH] D138464: Return None instead of Optional<T>() (NFC)

[Kazu Hirata via Phabricator via llvm-commits]

kazu added a comment.

Thanks for the review!

In D138464#3942626 <https://reviews.llvm.org/D138464#3942626>, @MaskRay wrote:

> We have `return llvm::None;` and `return None;`. Shall we always prefer `llvm::None`?

Either one is OK (to me).  I can deprecate `None` in my personal tree, and get a warning for both `llvm::None` and `None`.


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