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use std::fmt;
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struct Circle {
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radius: i32,
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}
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impl fmt::Display for Circle {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "Circle of radius {}", self.radius)
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}
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}
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fn main() {
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let circle = Circle { radius: 6 };
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println!("{}", circle.to_string());
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}
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