evil_sets.rb

require 'binding_of_caller'

class Evil
  def initialize(other_binding, *vs)
    @other_binding = other_binding
    @vs = vs
  end

  def <(other)
    @vs.each { |v| @other_binding.local_variable_set(v, other[v]) }
  end
end

class Object
  def sets(bind,*vs)
    Evil.new(binding.of_caller(2), *vs)
  end
end

sets(:a, :b) < {a: 1, b: 2}