use of "haven't"

Hello,

I've come across this sentence: "In sitting here, I haven't a care in the world."

I understand that the person is saying that s/he has nothing to worry about. Although, why does s/he say "haven't" instead of "don't have"?

I've already seen the use of "haven't" like this. Is it informal?

Thank you so much.

Best wishes.

1/25/214:17 PM

Original Post

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