# File lib/diff/lcs/block.rb, line 39
39:   def op
40:     case [@remove.empty?, @insert.empty?]
41:     when [false, false]
42:       '!'
43:     when [false, true]
44:       '-'
45:     when [true, false]
46:       '+'
47:     else # [true, true]
48:       '^'
49:     end
50:   end