Attempt to fix cryptic missing implicit.

ArgParserImplicits has been the cause of many cryptic zinc compile
crashes even before 2.12.4 upgrade. Maybe moving the implicits helps.

scalafix-cli/src/main/scala/scalafix/cli/Cli.scala

@@ -21,7 +21,7 @@ import org.typelevel.paiges.Doc
 
 object Cli {
   private def wrap(msg: String) = Doc.paragraph(msg).render(70)
-  import scalafix.internal.cli.ArgParserImplicits._
+  import scalafix.internal.cli.ScalafixOptions._
   private lazy val withHelp: Messages[WithHelp[ScalafixOptions]] = {
     val messages =
       OptionsMessages.copy(optionsDesc = "[options] [<file>...]").withHelp

scalafix-cli/src/main/scala/scalafix/internal/cli/ScalafixOptions.scala

@@ -10,6 +10,9 @@ import scalafix.internal.config.ScalafixReporter
 import scalafix.internal.rule.ProcedureSyntax
 import scalafix.rule.ScalafixRules
 import caseapp._
+import caseapp.core.ArgParser
+import caseapp.core.Messages
+import caseapp.core.Parser
 
 case class CommonOptions(
     @Hidden workingDirectory: String = System.getProperty("user.dir"),
@@ -161,3 +164,12 @@ case class ScalafixOptions(
       outStream = if (stdout) common.err else common.out
     )
 }
+
+object ScalafixOptions {
+  implicit val inputStreamRead: ArgParser[InputStream] =
+    ArgParser.instance[InputStream]("stdin")(_ => Right(System.in))
+  implicit val printStreamRead: ArgParser[PrintStream] =
+    ArgParser.instance[PrintStream]("stdout")(_ => Right(System.out))
+  val OptionsParser: Parser[ScalafixOptions] = Parser.apply[ScalafixOptions]
+  val OptionsMessages: Messages[ScalafixOptions] = Messages[ScalafixOptions]
+}