class RuboCop::Cop::Style::ParallelAssignment::AssignmentSorter

def accesses?(rhs, lhs)

Does `rhs` access the same value which is assigned by `lhs`?
`lhs` is an assignment method call like `obj.attr=` or `ary[idx]=`. 
def accesses?(rhs, lhs)
  if lhs.method_name == :[]=
    matching_calls(rhs, lhs.receiver, :[]).any? do |args|
      args == lhs.method_args
    end
  else
    access_method = lhs.method_name.to_s.chop.to_sym
    matching_calls(rhs, lhs.receiver, access_method).any?
  end
end