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js destructuring macro

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// Note: there are bugs in hygienic renaming, so this doesn't work all the time yet.
 
macro varr {
  case [$var (,) ...] = $expr => { 
      var i = 0;
      var arr = $expr;
      $(var $var = arr[i++];) ...
  }
 
  case {$var (,) ...} = $expr => { 
      var obj = $expr;
      $(var $var = obj.$var;) ...
  }
 
  case $var:ident = $expr => {
      var $var = $expr
  }
}
 
varr [x, y, z] = [0, 1, 2];
console.log(x, y, z); // 0 1 2
 
varr {x, y, z} = {x: 5, y: 6, z: 7};
console.log(x, y, z); // 5 6 7
 
varr w = 10;
console.log(w); // 10

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