Scala 2.12.0 ~ 2.12.2 no longer works

[eed3si9n]

steps

Use Scala 2.12.1

problem

[info] Non-compiled module 'compiler-bridge_2.12' for Scala 2.12.1. Compiling...
/var/folders/hg/2602nfrs2958vnshglyl3srw0000gn/T/sbt_f35b067/xsbt/Compat.scala:26: error: not found: type OriginalTreeAttachment
    in.attachments.get[OriginalTreeAttachment].foreach { a =>
                       ^

expectation

Scala 2.12.1 works

notes

#985 added a reference to OriginalTreeAttachment, which didn't exist until scala/scala@2e9a585.
Is there a way to access the attachment using reflection? Otherwise we could split the compiler bridge.

[eed3si9n]

#985 (comment)