Macro description 

macro_rules! description {
    ($description:expr) => { ... };
}

Embed a description into a compiled Cargo subcommand, to be shown by cargo --list.

The following restrictions apply to a subcommand description:

• String length can be at most 280 bytes in UTF-8, although much shorter is better.
• Must not contain the characters \n, \r, or \x1B (ESC).

Please consider running cargo --list and following the style of the existing descriptions of the built-in Cargo subcommands.

Example

// subcommand's main.rs

cargo_subcommand_metadata::description! {
    "Draw a spiffy visualization of things"
}

fn main() {
    /* … */
}