Why can't I create hashes where the keys are variables?

  var klass = Class.create(
   initialize: function() {
      this.field = new Hash({klass.staticVar: 999});
  klass.staticVar = 888;

  SyntaxError: missing : after property id {  message="missing : after
property id",  more...}

I can only get rid of the error when use resolved primitives as the

  var noError = new Hash({'primitive': 999});

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