Specs2でinのネストができなくなってた！

HogeSpec.scala

import org.specs2.mutable.Specification

class HogeSpec extends Specification {
  "One" should {
     "Two test" in {
       2 === 2
     }
     "Two" in {
       "Three test" in {
         3 === 3
       }
       "Three" in {
         "Four test" in {
           4 === 4
         }
         "Four" in {
           "Five test" in {
              5 === 5
           }
           "Five" in {
             "Six test" in {
               6 === 6
             }
           }
         }
       }
     }
  }
}

HogeSpecRefine.scala

// https://github.com/etorreborre/specs2/blob/master/notes/1.12.markdown

import org.specs2.mutable.Specification

class HogeSpec extends Specification {
  "One" should {
     "Two test" >> {
       2 === 2
     }
     "Two" >> {
       "Three test" >> {
         3 === 3
       }
       "Three" >> {
         "Four test" >> {
           4 === 4
         }
         "Four" >> {
           "Five test" >> {
              5 === 5
           }
           "Five" >> {
             "Six test" >> {
               6 === 6
             }
           }
         }
       }
     }
  }
}

scala2.9.1_specs1.11

[info] HogeSpec
[info]
[info] One should
[info] + Two test
[info]   Two
[info]   + Three test
[info]     Three
[info]     + Four test
[info]       Four
[info]       + Five test
[info]         Five
[info]         + Six test
[info]
[info]
[info]
[info]
[info]
[info]
[info] Total for specification HogeSpec
[info] Finished in 95 ms
[info] 5 examples, 0 failure, 0 error
[info]
[info] Passed: : Total 5, Failed 0, Errors 0, Passed 5, Skipped 0

scala2.9.1_specs1.12

[info] HogeSpec
[info]
[info] One should
[info] + Two test
[info]   Two
[info]
[info] + Three test
[info]   Three
[info]
[info] + Four test
[info]   Four
[info]
[info] + Five test
[info]   Five
[info]   + Six test
[info]
[info]
[info]
[info] Total for specification HogeSpec
[info] Finished in 191 ms
[info] 5 examples, 0 failure, 0 error
[info]
[info] Passed: : Total 5, Failed 0, Errors 0, Passed 5, Skipped 0

scala2.9.1_specs1.12.4

[info] HogeSpec
[info]
[info] One should
[info] + Two test
[info] + Two
[info]
[info]
[info] Total for specification HogeSpec
[info] Finished in 20 ms
[info] 2 examples, 0 failure, 0 error
[info]
[info] Passed: : Total 2, Failed 0, Errors 0, Passed 2, Skipped 0