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$ cargo run
Compiling rectangles v0.1.0 (file:///projects/rectangles)
error[E0277]: `Rectangle` doesn't implement `std::fmt::Display`
--> src/main.rs:12:29
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12 | println!("rect1 is {}", rect1);
| ^^^^^ `Rectangle` cannot be formatted with the default formatter
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= help: the trait `std::fmt::Display` is not implemented for `Rectangle`
= note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
= note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
For more information about this error, try `rustc --explain E0277`.
error: could not compile `rectangles` due to previous error
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