# Method Array.compact_diff3()

Method compact_diff3

  ``array`(`array`(`array`)) compact_diff3(`array` `a`, `array` `b`, `array` `old`)`

Description

  Given three arrays like those returned from diff3, this function "compacts" the diff3 result by removing all differences where `a` and `b` agrees against `old`. The result is on the same form as the result from diff, and doesn't include the sequence from `old`.