rust/tests/source/macro_rules.rs

// rustfmt-error_on_line_overflow: false

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;
}