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Eugene Yokota
3a1463bb7d
Ref https://github.com/scala/bug/issues/12112 Current app transformation macro creates a tree that looks like: ```scala FullInstance.app[[T0[x]](T0[Int], T0[Int]), Unit](scala.Tuple2(task2, task1), (($p$macro$3: (Int, Int)) => { <synthetic> val $q$macro$2: Int = $p$macro$3._1; <synthetic> val $q$macro$1: Int = $p$macro$3._2; { ($q$macro$1: Int); ($q$macro$2: Int); () } }))(AList.tuple2[Int, Int]) ``` Starting Scala 2.12.12 the compiler's "pure expression does nothing" has become more enthusiastic/accurate in its reach, and it started warning about the naked reference to `$q$macro$1` that appears to do nothing, even though in reality it would trigger the tasks and do something in the context of sbt. It's just _that_ particular line ends up macroed away into a pure expression. A somewhat bizarre workaround is to make a fake call to a method just to satisfy this warning. I've chosen `scala.Predef.identity` here so it can be composed together with the existing expression nesting when they exist.
sbt
sbt is a build tool for Scala, Java, and more.
For general documentation, see https://www.scala-sbt.org/.
sbt 1.x
This is the 1.x series of sbt. The source code of sbt is split across several GitHub repositories, including this one.
- sbt/io hosts
sbt.iomodule. - sbt/librarymanagement hosts
sbt.librarymanagementmodule that wraps Ivy. - sbt/zinc hosts Zinc, an incremental compiler for Scala.
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Other links
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