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6- titleDisplay in core::fmt - Rust
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3- https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn+main()+%7B%0A++++use+std::fmt;%0A++++%0A++++struct+Point+%7B%0A++++++++x:+i32,%0A++++++++y:+i32,%0A++++%7D%0A++++%0A++++impl+fmt::Display+for+Point+%7B%0A++++++++fn+fmt(%26self,+f:+%26mut+fmt::Formatter%3C'_%3E)+-%3E+fmt::Result+%7B%0A++++++++++++write!(f,+%22(%7B%7D,+%7B%7D)%22,+self.x,+self.y)%0A++++++++%7D%0A++++%7D%0A++++%0A++++let+origin+=+Point+%7B+x:+0,+y:+0+%7D;%0A++++%0A++++assert_eq!(format!(%22The+origin+is:+%7Borigin%7D%22),+%22The+origin+is:+(0,+0)%22);%0A%7D&edition=2021
- https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn+main()+%7B%0A++++use+std::fmt;%0A++++%0A++++struct+Position+%7B%0A++++++++longitude:+f32,%0A++++++++latitude:+f32,%0A++++%7D%0A++++%0A++++impl+fmt::Display+for+Position+%7B%0A++++++++fn+fmt(%26self,+f:+%26mut+fmt::Formatter%3C'_%3E)+-%3E+fmt::Result+%7B%0A++++++++++++write!(f,+%22(%7B%7D,+%7B%7D)%22,+self.longitude,+self.latitude)%0A++++++++%7D%0A++++%7D%0A++++%0A++++assert_eq!(%0A++++++++%22(1.987,+2.983)%22,%0A++++++++format!(%22%7B%7D%22,+Position+%7B+longitude:+1.987,+latitude:+2.983,+%7D),%0A++++);%0A%7D&edition=2021
- https://tools.ietf.org/html/rfc5952