#rank, :reference assignment

gistfile1.rb

[331] pry(main)> out
=> 
{ layers:
  [
    [0, 1]
    [0, 0]
  ]

  [
    [1, 0]
    [0, 0]
  ]
}
[332] pry(main)> first
=> 
{ layers:
  [
    [0, 2]
  ]

  [
    [1, 3]
  ]
}
# It would be great if this were possible
[335] pry(main)> out.rank(0, 0...out.shape[0]-1, :reference) = first
SyntaxError: unexpected '=', expecting end-of-input
out.rank(0, 0...out.shape[0]-1, :reference) = first