Rust: macros notation

	//
	// #[item_attribute] - attribute for module or file
	//
	// #![crate_attribute] - attribute for crate
	//
	// - #[attribute = "value"]
	// - #[attribute(key = "value")]
	// - #[attribute(value)]
	//
	// #![crate_type = "lib"] - crate as library (instead `--crate-type` compile param)
	// #![crate_name = "something"] - library is named "something"
	//
	#[cfg(target_os = "linux")]
	fn are_you_on_linux() {
	println!("you are running linux!")
	}
	#[cfg(not(target_os = "linux"))]
	fn are_you_on_linux() {
	println!("you are *not* running linux!")
	}
	#[cfg(not(some_key))]
	fn conditional_function() {
	println!("you don't pass `--cfg some_key`!")
	}
	#[cfg(some_key)]
	fn conditional_function() {
	println!("you just pass `--cfg some_key`!")
	}
	// allow unused code
	#[allow(dead_code)]
	// allow camel case type names
	#[allow(non_camel_case_types)]
	// add default Show trait implementation to struct
	#[deriving(Show)]
	struct SomeStructure (int, int);
	fn main() {
	are_you_on_linux();
	conditional_function();
	println!("test deriving Show - {}", SomeStructure(1,2));
	}

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