[clang/unittests] Use std::nullopt instead of None (NFC)

This patch mechanically replaces None with std::nullopt where the
compiler would warn if None were deprecated.  The intent is to reduce
the amount of manual work required in migrating from Optional to
std::optional.

This is part of an effort to migrate from llvm::Optional to
std::optional:

https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716

1 files changed, 3 insertions, 3 deletions

diff --git a/clang/unittests/Tooling/TransformerTest.cpp b/clang/unittests/Tooling/TransformerTest.cpp
index 7367282..6d6ed33 100644
--- a/clang/unittests/Tooling/TransformerTest.cpp
+++ b/clang/unittests/Tooling/TransformerTest.cpp
@@ -110,18 +110,18 @@ protected:
             "clang-tool", std::make_shared<PCHContainerOperations>(),
             FileContents)) {
       llvm::errs() << "Running tool failed.\n";
-      return None;
+      return std::nullopt;
     }
     if (ErrorCount != 0) {
       llvm::errs() << "Generating changes failed.\n";
-      return None;
+      return std::nullopt;
     }
     auto ChangedCode =
         applyAtomicChanges("input.cc", Code, Changes, ApplyChangesSpec());
     if (!ChangedCode) {
       llvm::errs() << "Applying changes failed: "
                    << llvm::toString(ChangedCode.takeError()) << "\n";
-      return None;
+      return std::nullopt;
     }
     return *ChangedCode;
   }