Hello Swift community, I found `__attribute__((sentinel(0,1)))` at https://github.com/apple/swift-clang/blob/c52d85ede49adaec457400697b1d4c1b7ea12881/test/Analysis/variadic-method-types.m#L46. But I can't imagine how different it is from the `__attribute__((sentinel))`.
So,why we need `__attribute__((sentinel(0,1)))`? Thanks.
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