Sweet.js bound access macro

bind.js

macro (~) {
	rule infix { $l:expr | $r:ident } => { (ref = $l, ref.$r.bind(ref)) }
	rule infix { $l:expr | $r:expr } => { (ref = $l, ref[$r].bind(ref)) }
}

var c = a~b;

a({
  b: c~(foo)
});