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* [ObjC] Boxed strings should use the nullability from stringWithUTF8String's ↵Alex Lorenz2017-11-081-0/+28
return type Objective-C NSString has a class method stringWithUTF8String that creates a new NSString from a C string. Objective-C box expression @(...) can be used to create an NSString instead of invoking the stringWithUTF8String method directly (The compiler lowers it down to the invocation though). This commit ensures that the type of @(string-value) gets the same nullability attributes as the return type of stringWithUTF8String to ensure that the diagnostics are consistent between the two. rdar://33847186 Differential Revision: https://reviews.llvm.org/D39762 git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@317727 91177308-0d34-0410-b5e6-96231b3b80d8