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As I said, it wouldn't be a syntax error if ... contained the matching { somewhere inside.

That lone } which seemingly belongs to if in this case would be closing the function.

They are talking about the } after the return, not the one after the ... i.e. else return(1); }

Yes, that's what I understood. That } after return matches to the function opening {. So it's correct syntactically, but is wrong according to intention.

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