Rest of fixable warnings

build.sbt

@@ -5,7 +5,12 @@ ThisBuild / organization := "com.github.cross-language-cpp"
 
 ThisBuild / semanticdbEnabled := true // enable SemanticDB
 ThisBuild / semanticdbVersion := scalafixSemanticdb.revision // use Scalafix compatible version
-ThisBuild / scalacOptions += "-Ywarn-unused"
+
+// Keep this as a reminder, we will use that later
+// ThisBuild / scalacOptions += "-Ywarn-unused"
+// us: sbt 'set ThisBuild / scalacOptions += "-Ywarn-unused"' scalafix
+// until the last 2 unused warnings are fixed
+ThisBuild / scalacOptions ++= Seq("-deprecation", "-unchecked")
 
 val binExt = if (System.getProperty("os.name").startsWith("Windows")) ".bat" else ""
 lazy val djinni = (project in file("."))

src/main/scala/djinni/parser.scala

@@ -30,6 +30,7 @@ import java.io.Writer
 import java.util.{Map => JMap}
 import scala.collection.JavaConverters._
 import scala.collection.mutable
+import scala.collection.mutable.ArrayStack
 import scala.util.matching.Regex
 import scala.util.parsing.combinator.RegexParsers
 import scala.util.parsing.input.Position
@@ -38,7 +39,7 @@ import scala.util.parsing.input.Positional
 case class Parser(includePaths: List[String]) {
 
   val visitedFiles: mutable.Set[File] = mutable.Set[File]()
-  val fileStack: mutable.Stack[File] = mutable.Stack[File]()
+  val fileStack: ArrayStack[File] = ArrayStack[File]()
 
   private object IdlParser extends RegexParsers {
     override protected val whiteSpace: Regex = """[ \t\n\r]+""".r