PP::PPMethods#pp_hash_pair

# File tmp/rubies/ruby-4.1.0-preview1/lib/pp.rb, line 314
def pp_hash_pair(k, v)
  if Symbol === k
    if k.inspect.match?(%r[\A:["$@!]|[%&*+\-\/<=>@\]^`|~]\z])
      k = k.to_s.inspect
    end
    text "#{k}:"
  else
    pp k
    text ' '
    text '=>'
  end
  group(1) {
    breakable
    pp v
  }
end