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$ cargo run
Compiling traits-example v0.1.0 (file:///projects/traits-example)
error[E0277]: `Point` doesn't implement `std::fmt::Display`
--> src/main.rs:20:6
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20 | impl OutlinePrint for Point {}
| ^^^^^^^^^^^^ `Point` cannot be formatted with the default formatter
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= help: the trait `std::fmt::Display` is not implemented for `Point`
= note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
note: required by a bound in `OutlinePrint`
--> src/main.rs:3:21
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3 | trait OutlinePrint: fmt::Display {
| ^^^^^^^^^^^^ required by this bound in `OutlinePrint`
For more information about this error, try `rustc --explain E0277`.
error: could not compile `traits-example` due to previous error
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