Macro prefix_items 

macro_rules! prefix_items {
    (
		$({$map:path})?
		($($prefix:tt)*)
		{$($item:item)*}
	) => { ... };
}

Prefixes tokens to items.

This is a convenience wrapper around prefix! for use with items. It takes the same arguments as prefix!, but transforms each item given into an individual token group.

prefix_items! {
	(
		#[cfg(feature = "foo")]
	)
	{
		fn foo() {}
		fn bar() {}
		fn baz() {}
	}
}

// Expands to:
// #[cfg(feature = "foo")]
// fn foo() {}
// #[cfg(feature = "foo")]
// fn bar() {}
// #[cfg(feature = "foo")]
// fn baz() {}