anchor.diff:    /// String to enable the experiment "constant-update"
     static const String constant_update_2018 = 'constant-update-2018';
   
  +  /// String to enable the experiment "control-flow-collections"
  +  static const String control_flow_collections = 'control-flow-collections';
  +
     /// String to enable the experiment "non-nullable"
     static const String non_nullable = 'non-nullable';
   
     /// String to enable the experiment "set-literals"
     static const String set_literals = 'set-literals';
  +
  +  /// String to enable the experiment "spread-collections"
  +  static const String spread_collections = 'spread-collections';
   
     /// String to enable the experiment "bogus-disabled"
     static const String bogus_disabled = 'bogus-disabled';
  
positive.code:         IsEnabledByDefault.non_nullable,
          IsExpired.non_nullable,
          'Non Nullable'),
      EnableString.bogus_disabled: const ExperimentalFeature(
          null,
          EnableString.bogus_disabled,
  
negative.code:   /// Expiration status of the experiment "constant-update"
    static const bool constant_update_2018 = false;
  
    /// Expiration status of the experiment "control-flow-collections"
    static const bool control_flow_collections = false;
  
    /// Expiration status of the experiment "non-nullable"
    static const bool non_nullable = false;
  
    /// Expiration status of the experiment "set-literals"
    static const bool set_literals = false;
  
    /// Expiration status of the experiment "spread-collections"
    static const bool spread_collections = false;
  
    /// Expiration status of the experiment "bogus-disabled"
    static const bool bogus_disabled = true;
  
  