Formatting error in complex agrument types

[skitanoooo]

Configuration (required)

version = 3.8.3
runner.dialect = scala213source3
preset = default

newlines.source = keep
align.openParenCallSite = true

Command-line parameters (required)

When I run scalafmt via CLI like this: scalafmt A.scala

Steps

Given code like this:

package foo

object A {
  def f(a: (
             Seq[Int],
               Seq[Int]) =
           (Seq(), Seq())): Unit = ???
}

Problem

Scalafmt formats code like this:

> scalafmt <path>/A.scala
org.scalafmt.cli.FailedToFormat: <path>/A.scala
Caused by: org.scalafmt.Error$PreciseIncomplete: <path>/A.scala:4: error: Unable to format file due to bug in scalafmt
  def f(a: (
           ^
	at org.scalafmt.Scalafmt$.$anonfun$doFormatOne$6(Scalafmt.scala:123)
	at scala.util.Success.flatMap(Try.scala:266)
	at org.scalafmt.Scalafmt$.$anonfun$doFormatOne$3(Scalafmt.scala:118)
	at scala.meta.parsers.Parsed.fold(Errors.scala:11)
	at scala.meta.parsers.Parsed.fold$(Errors.scala:10)
	at scala.meta.parsers.Parsed$Success.fold(Errors.scala:25)
	at org.scalafmt.Scalafmt$.doFormatOne(Scalafmt.scala:114)
	at org.scalafmt.Scalafmt$.doFormat(Scalafmt.scala:90)
	at org.scalafmt.Scalafmt$.$anonfun$formatCode$3(Scalafmt.scala:78)
	at scala.util.Success.fold(Try.scala:289)
	at org.scalafmt.Scalafmt$.formatCode(Scalafmt.scala:78)
	at org.scalafmt.Scalafmt$.format(Scalafmt.scala:57)
	at org.scalafmt.Scalafmt.format(Scalafmt.scala)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.scalafmt.dynamic.ScalafmtReflect.$anonfun$tryFormat$1(ScalafmtReflect.scala:121)
	at scala.util.Try$.apply(Try.scala:217)
	at org.scalafmt.dynamic.ScalafmtReflect.tryFormat(ScalafmtReflect.scala:117)
	at org.scalafmt.dynamic.ScalafmtReflectConfig.tryFormat(ScalafmtReflectConfig.scala:95)
	at org.scalafmt.dynamic.ScalafmtDynamicSession.$anonfun$tryForceFormat$1(ScalafmtDynamicSession.scala:49)
	at scala.util.Success.flatMap(Try.scala:266)
	at org.scalafmt.dynamic.ScalafmtDynamicSession.tryForceFormat(ScalafmtDynamicSession.scala:49)
	at org.scalafmt.dynamic.ScalafmtDynamicSession.tryFormat(ScalafmtDynamicSession.scala:36)
	at org.scalafmt.dynamic.ScalafmtDynamicSession.format(ScalafmtDynamicSession.scala:18)
	at org.scalafmt.cli.ScalafmtDynamicRunner$.handleFile(ScalafmtDynamicRunner.scala:74)
	at org.scalafmt.cli.ScalafmtDynamicRunner$.$anonfun$run$7(ScalafmtDynamicRunner.scala:48)
	at org.scalafmt.cli.ScalafmtDynamicRunner$.$anonfun$run$7$adapted(ScalafmtDynamicRunner.scala:46)
	at scala.collection.IterableOnceOps.foreach(IterableOnce.scala:619)
	at scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:617)
	at scala.collection.AbstractIterator.foreach(Iterator.scala:1303)
	at scala.collection.parallel.ParIterableLike$Foreach.leaf(ParIterableLike.scala:938)
	at scala.collection.parallel.Task.$anonfun$tryLeaf$1(Tasks.scala:52)
	at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
	at scala.util.control.Breaks$$anon$1.catchBreak(Breaks.scala:97)
	at scala.collection.parallel.Task.tryLeaf(Tasks.scala:55)
	at scala.collection.parallel.Task.tryLeaf$(Tasks.scala:49)
	at scala.collection.parallel.ParIterableLike$Foreach.tryLeaf(ParIterableLike.scala:935)
	at scala.collection.parallel.AdaptiveWorkStealingTasks$AWSTWrappedTask.compute(Tasks.scala:152)
	at scala.collection.parallel.AdaptiveWorkStealingTasks$AWSTWrappedTask.compute$(Tasks.scala:148)
	at scala.collection.parallel.AdaptiveWorkStealingForkJoinTasks$AWSFJTWrappedTask.compute(Tasks.scala:304)
	at java.base/java.util.concurrent.RecursiveAction.exec(RecursiveAction.java:194)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)

Expectation

Workaround

If either of these lines are removed, it will not reproduce

newlines.source = keep
align.openParenCallSite = true

Notes

This code also raises an error.

package foo

object A {
//  def f(a: (
//             Seq[Int],
//               Seq[Int]) =
//           (Seq(), Seq())): Unit = ???

  private def g: Either[
    (
      Int, Option[Int]),
    (Int, Option[Int])
  ] = ???
}

> scalafmt <path>/A.scala
org.scalafmt.cli.FailedToFormat: <path>/A.scala
Caused by: org.scalafmt.Error$PreciseIncomplete: <path>/A.scala:10: error: Unable to format file due to bug in scalafmt
    (
    ^
	at org.scalafmt.Scalafmt$.$anonfun$doFormatOne$6(Scalafmt.scala:123)
	at scala.util.Success.flatMap(Try.scala:266)
	at org.scalafmt.Scalafmt$.$anonfun$doFormatOne$3(Scalafmt.scala:118)
	at scala.meta.parsers.Parsed.fold(Errors.scala:11)
	at scala.meta.parsers.Parsed.fold$(Errors.scala:10)
	at scala.meta.parsers.Parsed$Success.fold(Errors.scala:25)
	at org.scalafmt.Scalafmt$.doFormatOne(Scalafmt.scala:114)
	at org.scalafmt.Scalafmt$.doFormat(Scalafmt.scala:90)
	at org.scalafmt.Scalafmt$.$anonfun$formatCode$3(Scalafmt.scala:78)
	at scala.util.Success.fold(Try.scala:289)
	at org.scalafmt.Scalafmt$.formatCode(Scalafmt.scala:78)
	at org.scalafmt.Scalafmt$.format(Scalafmt.scala:57)
	at org.scalafmt.Scalafmt.format(Scalafmt.scala)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.scalafmt.dynamic.ScalafmtReflect.$anonfun$tryFormat$1(ScalafmtReflect.scala:121)
	at scala.util.Try$.apply(Try.scala:217)
	at org.scalafmt.dynamic.ScalafmtReflect.tryFormat(ScalafmtReflect.scala:117)
	at org.scalafmt.dynamic.ScalafmtReflectConfig.tryFormat(ScalafmtReflectConfig.scala:95)
	at org.scalafmt.dynamic.ScalafmtDynamicSession.$anonfun$tryForceFormat$1(ScalafmtDynamicSession.scala:49)
	at scala.util.Success.flatMap(Try.scala:266)
	at org.scalafmt.dynamic.ScalafmtDynamicSession.tryForceFormat(ScalafmtDynamicSession.scala:49)
	at org.scalafmt.dynamic.ScalafmtDynamicSession.tryFormat(ScalafmtDynamicSession.scala:36)
	at org.scalafmt.dynamic.ScalafmtDynamicSession.format(ScalafmtDynamicSession.scala:18)
	at org.scalafmt.cli.ScalafmtDynamicRunner$.handleFile(ScalafmtDynamicRunner.scala:74)
	at org.scalafmt.cli.ScalafmtDynamicRunner$.$anonfun$run$7(ScalafmtDynamicRunner.scala:48)
	at org.scalafmt.cli.ScalafmtDynamicRunner$.$anonfun$run$7$adapted(ScalafmtDynamicRunner.scala:46)
	at scala.collection.IterableOnceOps.foreach(IterableOnce.scala:619)
	at scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:617)
	at scala.collection.AbstractIterator.foreach(Iterator.scala:1303)
	at scala.collection.parallel.ParIterableLike$Foreach.leaf(ParIterableLike.scala:938)
	at scala.collection.parallel.Task.$anonfun$tryLeaf$1(Tasks.scala:52)
	at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
	at scala.util.control.Breaks$$anon$1.catchBreak(Breaks.scala:97)
	at scala.collection.parallel.Task.tryLeaf(Tasks.scala:55)
	at scala.collection.parallel.Task.tryLeaf$(Tasks.scala:49)
	at scala.collection.parallel.ParIterableLike$Foreach.tryLeaf(ParIterableLike.scala:935)
	at scala.collection.parallel.AdaptiveWorkStealingTasks$AWSTWrappedTask.compute(Tasks.scala:152)
	at scala.collection.parallel.AdaptiveWorkStealingTasks$AWSTWrappedTask.compute$(Tasks.scala:148)
	at scala.collection.parallel.AdaptiveWorkStealingForkJoinTasks$AWSFJTWrappedTask.compute(Tasks.scala:304)
	at java.base/java.util.concurrent.RecursiveAction.exec(RecursiveAction.java:194)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)

Please note that this/these problem was not caused by intentionally giving pathological code to cause errors, but was accidental due to the corrupted formatting that existed in our project.