ruby hash with self referencing elements / recursive hash -

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I want a ruby ​​hash with key: a ,: b ,: c because that is HK: [B] = H [: A] + 1; H [: c] = h [: b] + 2 etc.

How can I define such a hash in a line declaration like H = {: A => 1,: B => H [: A] + 1 ,: c => H [: B] +2, ...}?

Property: Path, FilePath

Property: md5sum, string ,: default => lambda {| R, p | Digest :: MD5.hexdigest (r.path.read)}

Where: md5sum default value is referenced: path property

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