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[Non tradotto] Inline Module

A sub-module can be directly inlined within a module's code.

One very common use for inline modules is creating unit tests. We create an inline module that only exists when Rust is used for testing!

// This macro removes this inline module when Rust 
// is not in test mode.
#[cfg(test)]
mod tests {
    // Notice that we don't immediately get access to the 
    // parent module. We must be explicit.
    use super::*;

    ... tests go here ...
}
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