bash-3.2$ java -jar ./build/compiler.jar < markdown.js > markdown-minified.js
The compiler is waiting for input via stdin.
stdin:320: ERROR - Parse error. IE8 (and below) will parse trailing commas in array and object literals incorrectly. If you are targeting newer versions of JS, set the appropriate language_in option.
          set: function(value) { obj[fieldProp] = value; },
                                                          ^

stdin:1528: ERROR - Parse error. IE8 (and below) will parse trailing commas in array and object literals incorrectly. If you are targeting newer versions of JS, set the appropriate language_in option.
    },
     ^

2 error(s), 0 warning(s)
bash-3.2$ 

var $pointerOfStructConversion = function(obj, type) {
  if(obj.$proxies === undefined) {
    obj.$proxies = {};
    obj.$proxies[obj.constructor.string] = obj;
  }
  var proxy = obj.$proxies[type.string];
  if (proxy === undefined) {
    var properties = {};
    for (var i = 0; i < type.elem.fields.length; i++) {
      (function(fieldProp) {
        properties[fieldProp] = {
          get: function() { return obj[fieldProp]; },
          set: function(value) { obj[fieldProp] = value; },  /////<<< line 320, has extra comma at end
        };
      })(type.elem.fields[i].prop);
    }
    proxy = Object.create(type.prototype, properties);
    proxy.$val = proxy;
    obj.$proxies[type.string] = proxy;
    proxy.$proxies = obj.$proxies;
  }
  return proxy;
};

var $send = function(chan, value) {                                                                                             
  if (chan.$closed) {                                                                                                           
    $throwRuntimeError("send on closed channel");                                                                               
  }                                                                                                                             
  var queuedRecv = chan.$recvQueue.shift();                                                                                     
  if (queuedRecv !== undefined) {                                                                                               
    queuedRecv([value, true]);                                                                                                  
    return;                                                                                                                     
  }                                                                                                                             
  if (chan.$buffer.length < chan.$capacity) {                                                                                   
    chan.$buffer.push(value);                                                                                                   
    return;                                                                                                                     
  }                                                                                                                             

  var thisGoroutine = $curGoroutine;                                                                                            
  chan.$sendQueue.push(function() {                                                                                             
    $schedule(thisGoroutine);                                                                                                   
    return value;                                                                                                               
  });                                                                                                                           
  $block();                                                                                                                     
  return {                                                                                                                      
    $blk: function() {                                                                                                          
      if (chan.$closed) {                                                                                                       
        $throwRuntimeError("send on closed channel");                                                                           
      }                                                                                                                         
    },                             /////<<<< line 1528, extra comma at end                                                                                          
  };                                                                                                                            
};