Applying a Rust attribute to more than one line

user_24545 0
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To the best of my understanding of the Rust documentation, attributes are applied only to the line directly following an attribute. So, if I want to conditionally compile a line I can do this:

#[cfg(target_family = "unix")]
use termion::{color, style};

What happens when I want to conditionally compile two lines?

#[cfg(target_family = "unix")]
use termion::{color, style};
#[cfg(target_family = "unix")]
use termion::screen::*;

Is there a cleaner way for doing this?

rust conditional-compilation attributes
1 Answers

There's no general grouping answer to my knowledge but there are specific solutions.

Most often, you can just use a block:

#[cfg(target_family = "unix")]
{
    // some code
}

use statements can always be grouped together, even when there's no common root:

#[cfg(target_family = "unix")]
use {
    termion::{color, style},
    std::io,
};

attributes are applied only to the line directly following an attribute

Not really. They're applied to the following "thing". There's a list of supported "things" in the documentation. It's not all what you'd probably want (it's not an if expression for example) but there's already a lot of covered ground.

user_2635250
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