Exploit Code Block: Code error

[LavareX]

clang version: Apple LLVM version 8.0.0 (clang-800.0.42.1)
Xcode version: 7.3.1

NSURL *url = ({
    NSString *urlString = [NSString stringWithFormat:@"%@/%@", baseURLString, endpoint];
    [NSURL URLWithString:urlString];
});

compiler error: initializing 'NSURL *__strong' with an expression of incompatible type 'void'

The value of the latest statement is not returned if enclosing in round bracket.