doc.rust-lang.org/std/fmt
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6- titlestd::fmt - Rust
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- descriptionUtilities for formatting and printing `String`s.
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23- https://doc.rust-lang.org/reference/identifiers.html
- https://en.wikipedia.org/wiki/Rounding#Rounding_half_to_even
- https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0A%23!%5Ballow(dead_code)%5D%0A%0Afn+main()+%7B%0A++++use+std::fmt;%0A++++struct+Foo;+//+our+custom+type%0A++++impl+fmt::Display+for+Foo+%7B%0A++++fn+fmt(%26self,+f:+%26mut+fmt::Formatter%3C'_%3E)+-%3E+fmt::Result+%7B%0A++++write!(f,+%22testing,+testing%22)%0A++++%7D+%7D%0A%7D&edition=2024
- https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0A%23!%5Ballow(unused_must_use)%5D%0A%0Afn+main()+%7B%0A++++format!(%22%7B1%7D+%7B%7D+%7B0%7D+%7B%7D%22,+1,+2);%0A%7D&edition=2024
- https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0A%23!%5Ballow(unused_must_use)%5D%0A%0Afn+main()+%7B%0A++++format!(%22%7Bargument%7D%22,+argument+=+%22test%22);+++//+=%3E+%22test%22%0A++++format!(%22%7Bname%7D+%7B%7D%22,+1,+name+=+2);++++++++++//+=%3E+%222+1%22%0A++++format!(%22%7Ba%7D+%7Bc%7D+%7Bb%7D%22,+a=%22a%22,+b='b',+c=3);%0A%7D&edition=2024