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Coffeescript's `do` notation as a sweet.js macro

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macro $do {
case ($($x = $y) (,) ...) $body => {
(function ($x (,) ...) $body)($y (,) ...)
}
case $name ($($x = $y) (,) ...) $body => {
(function $name ($x (,) ...) $body)($y (,) ...)
}
}
 
$do (a = 1, b = 2) {
return a + b;
}
 
/* result:
(function (a$15, b$16) {
return a$15 + b$16;
}(1, 2));
*/
 
console.log($do fib(n=7) {
if (n > 1) return fib(n - 1) + fib(n - 2);
return 1;
});
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