curried lambdas with sweet.js

lambda.js

macro lam {
  rule { $x:ident $y:expr -> $body:expr } => {
    (function($x) { return lam $y -> $body; })
  }

  rule { $x:ident -> $body:expr } => {
    (function($x) { return $body; })
  }
}

// Macro               Expands to
// lam a -> a          function(a) { return a; }
// lam a b -> a + b    function(a) { return function(b) { return a + b; }; }