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a074de6ff4
This fixes an error introduced in r228934 where None was converted to an int instead of the int being converted to an Optional as intended. We make that sort of mistake a compile error by changing NoneType into a scoped enum. Finally, provide a static NoneType called None to avoid forcing all users to spell it NoneType::None. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229980 91177308-0d34-0410-b5e6-96231b3b80d8
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