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<p style="margin: 0px 0px 9px; line-height: 24px;"><!--StartFragment-->Hello Swift community,</p>
<p style="margin: 0px 0px 9px; line-height: 24px;">I found  `__attribute__((sentinel(0,1)))` at https://github.com/apple/swift-clang/blob/c52d85ede49adaec457400697b1d4c1b7ea12881/test/Analysis/variadic-method-types.m#L46.</p>
<p style="margin: 0px 0px 9px; line-height: 24px;">But I can't imagine how different it is from the `__attribute__((sentinel))`.</p><p style="margin: 0px 0px 9px; line-height: 24px;">So,why we need `__attribute__((sentinel(0,1)))`?</p><pre style="line-height: normal;">Thanks.</pre></div><div></div>