tuples.scala failing to compile on latest 2.13 nightly

[SethTisue]

after scala/community-build@7b464c2 https://scala-ci.typesafe.com/view/scala-2.13.x/job/scala-2.13.x-integrate-community-build/1405/ has

[shapeless] [error] /home/jenkins/workspace/scala-2.13.x-integrate-community-build/target-0.9.14/project-builds/shapeless-322d363001f435a63f5781c5552ae815938967a1/core/src/test/scala/shapeless/tuples.scala:398:27: could not find implicit value for parameter e: shapeless.ops.tuple.Unifier.Aux[(TupleTests.this.Apple, TupleTests.this.Pear, TupleTests.this.Apple, TupleTests.this.Pear),(TupleTests.this.PWS, TupleTests.this.PWS, TupleTests.this.PWS, TupleTests.this.PWS)]
[shapeless] [error]     val uapap = implicitly[Unifier.Aux[(Apple, Pear, Apple, Pear), (PWS, PWS, PWS, PWS)]]
[shapeless] [error]                           ^
[shapeless] [error] one error found

[SethTisue]

@milessabin any insight on this? I'm interested in getting this resolved in order to unblock downstream projects in the 2.13 community build

[milessabin]

It's at the front of the queue for tomorrow.

[milessabin]

git bisect is pointing it's finger, somewhat surprisingly, at scala/scala#6729. I'll try and find out what's going on.

[milessabin]

I've commented out the test that doesn't compile post M5 for now. More details here.