var test = {
    /**
     * Before bracket init
     */
    ['a']:'1',

    [/*
     * Inside bracket init
     */
    'b']:'2',

    ['c'
     /*
      * After bracket key
      */]:'3',

    // Before bracket, line comment
    [
        'd']:'4',

    [
        // Inside bracket, line comment
        'e']:'5',

    ['f'
      // After bracket, line comment
        ]:'6'
};