---
Hash (message='My nested hash'):
  Hash#size: 2
  Hash#default: 
  Hash#default_proc: 
  Pair 0:
    Key:
      Symbol:
        Symbol#to_s: a
        Symbol#size: 1
        Symbol#encoding: !ruby/encoding US-ASCII
    Value:
      Hash:
        Hash#size: 2
        Hash#default: 
        Hash#default_proc: 
        Pair 0:
          Key:
            Symbol:
              Symbol#to_s: b
              Symbol#size: 1
              Symbol#encoding: !ruby/encoding US-ASCII
          Value: Fixnum 0
        Pair 1:
          Key:
            Symbol:
              Symbol#to_s: c
              Symbol#size: 1
              Symbol#encoding: !ruby/encoding US-ASCII
          Value: Fixnum 1
  Pair 1:
    Key:
      Symbol:
        Symbol#to_s: d
        Symbol#size: 1
        Symbol#encoding: !ruby/encoding US-ASCII
    Value:
      Hash:
        Hash#size: 2
        Hash#default: 
        Hash#default_proc: 
        Pair 0:
          Key:
            Symbol:
              Symbol#to_s: e
              Symbol#size: 1
              Symbol#encoding: !ruby/encoding US-ASCII
          Value: Fixnum 2
        Pair 1:
          Key:
            Symbol:
              Symbol#to_s: f
              Symbol#size: 1
              Symbol#encoding: !ruby/encoding US-ASCII
          Value: Fixnum 3