error.rs

C:\Code\rust-cli>cargo check
    Checking rust-cli v0.1.0 (C:\Code\rust-cli)
error[E0277]: `Languages` doesn't implement `std::fmt::Display`
   --> src\main.rs:30:16
    |
30  |         .items(&languages)
    |          ----- ^^^^^^^^^^ `Languages` cannot be formatted with the default formatter
    |          |
    |          required by a bound introduced by this call
    |
    = help: the trait `std::fmt::Display` is not implemented for `Languages`
    = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
    = note: required because of the requirements on the impl of `ToString` for `Languages`
note: required by a bound in `Select::<'_>::items`
   --> C:\Users\Nicolai\.cargo\registry\src\github.com-1ecc6299db9ec823\dialoguer-0.10.2\src\prompts\select.rs:126:21
    |
126 |     pub fn items<T: ToString>(&mut self, items: &[T]) -> &mut Self {
    |                     ^^^^^^^^ required by this bound in `Select::<'_>::items`

error[E0277]: `Languages` doesn't implement `std::fmt::Display`
  --> src\main.rs:35:60
   |
35 |         Some(index) => println!("User selected item : {}", languages[index]),
   |                                                            ^^^^^^^^^^^^^^^^ `Languages` cannot be formatted with the default formatter
   |
   = help: the trait `std::fmt::Display` is not implemented for `Languages`
   = 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 `rust-cli` due to 2 previous errors

main.rs

use console::Term;
use dialoguer::{theme::ColorfulTheme, Select};
use strum::{EnumIter, IntoEnumIterator};

#[derive(Debug, EnumIter)]
enum Languages {
    TypeScript,
    JavaScript,
}

#[derive(Debug, EnumIter)]
enum PackageManagers {
    Yarn,
    Npm,
    Pnpm,
}

#[derive(Debug, EnumIter)]
enum Packages {
    Trpc,
    Prisma,
    Tailwind,
    NextAuth,
}

// main function
fn main() -> std::io::Result<()> {
    let languages: Vec<_> = Languages::iter().collect();
    let selection = Select::with_theme(&ColorfulTheme::default())
        .items(&languages)
        .default(0)
        .interact_on_opt(&Term::stderr())?;

    match selection {
        Some(index) => println!("User selected item : {}", languages[index]),
        None => println!("User did not select anything"),
    }

    Ok(())
}