E0425: cannot find value in this scope

Rust resolves every name at compile time. There is no global namespace you can fall back on, so a name has to be declared in scope or imported with `use`.

Blocks own their bindings: a `let` inside `{ ... }` disappears when the block ends. Declare the binding in the outer scope if you need it later.

Code that triggers it

fn main() {
    {
        let secret = 42;
    }
    println!("{secret}"); // error[E0425]
}

Code that compiles

fn main() {
    let secret = 42;
    println!("{secret}");
}

Declare the binding in the scope where you use it, check the spelling, and add the right `use` statement for items from other modules.

Try both versions

The broken version is loaded below so you can see the real compiler message, then fix it yourself.