rust/tests/source/macro_rules.rs

// rustfmt-error_on_line_overflow: false

macro_rules! m {
    () => ();
    ( $ x : ident ) => ();
    ( $ m1 : ident , $ m2 : ident , $ x : ident ) => ();
    ( $($beginning:ident),*;$middle:ident;$($end:ident),* ) => ();
    ( $($beginning: ident),*; $middle: ident; $($end: ident),*; $($beginning: ident),*; $middle: ident; $($end: ident),* ) => {};
    ( $ name : ident ( $ ( $ dol : tt $ var : ident ) * ) $ ( $ body : tt ) * ) => ();
    ( $( $ i : ident : $ ty : ty , $def : expr , $stb : expr , $ ( $ dstring : tt ) , + ) ; + $ ( ; ) *
      $( $ i : ident : $ ty : ty , $def : expr , $stb : expr , $ ( $ dstring : tt ) , + ) ; + $ ( ; ) *
    ) => {};
    ( $foo: tt foo [$ attr : meta] $name: ident ) => {};
    ( $foo: tt [$ attr: meta] $name: ident ) => {};
    ( $foo: tt &'a [$attr : meta] $name: ident ) => {};
    ( $foo: tt foo # [ $attr : meta] $name: ident ) => {};
    ( $foo: tt # [ $attr : meta] $name: ident) => {};
    ( $foo: tt &'a # [ $attr : meta] $name: ident ) => {};
    ( $ x : tt foo bar foo bar foo bar $ y : tt => x*y*z $ z : tt , $ ( $a: tt ) , * ) => {};
}

macro_rules! m {
	// a
	($expr :expr,  $( $func : ident    ) *   ) => {
		{
		let    x =    $expr;
									                $func (
														x
											)
	}
	};

				/* b */

   	()           => {/* c */};

		 				(@tag)   =>
						 {

						 };

// d
( $item:ident  ) =>      {
	mod macro_item    {  struct $item ; }
};
}

macro m2 {
	// a
	($expr :expr,  $( $func : ident    ) *   ) => {
		{
		let    x =    $expr;
									                $func (
														x
											)
	}
	}

				/* b */

   	()           => {/* c */}

		 				(@tag)   =>
						 {

						 }

// d
( $item:ident  ) =>      {
	mod macro_item    {  struct $item ; }
}
}

// #2438, #2476
macro_rules! m {
    () => {
        fn foo() {
            this_line_is_98_characters_long_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(
            );
        }
    }
}
macro_rules! m {
    () => {
        fn foo() {
            this_line_is_99_characters_long_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(
);
        }
    };
}
macro_rules! m {
    () => {
        fn foo() {
            this_line_is_100_characters_long_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(
);
        }
    };
}
macro_rules! m {
    () => {
        fn foo() {
            this_line_is_101_characters_long_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(
            );
        }
    };
}

// #2439
macro_rules! m {
    ($line0_xxxxxxxxxxxxxxxxx: expr, $line1_xxxxxxxxxxxxxxxxx: expr, $line2_xxxxxxxxxxxxxxxxx: expr, $line3_xxxxxxxxxxxxxxxxx: expr,) => {};
}

// #2466
// Skip formatting `macro_rules!` that are not using `{}`.
macro_rules! m (
    () => ()
);
macro_rules! m [
    () => ()
];

// #2470
macro foo($type_name: ident, $docs: expr) {
    #[allow(non_camel_case_types)]
    #[doc=$docs]
    #[derive(Debug, Clone, Copy)]
    pub struct $type_name;
}

// #2538
macro_rules! add_message_to_notes {
    ($msg:expr) => {{
        let mut lines = message.lines();
        notes.push_str(&format!("\n{}: {}", level, lines.next().unwrap()));
        for line in lines {
            notes.push_str(&format!(
                "\n{:indent$}{line}",
                "",
                indent = level.len() + 2,
                line = line,
            ));
        }
    }}
}