Add inliner

build.sbt

@@ -58,6 +58,17 @@ scalacOptions ++= Seq(
   "-encoding",
   "UTF-8"
 )
+
+ThisBuild / scalacOptions ++= {
+  CrossVersion.partialVersion(scalaVersion.value) match {
+    case Some((2, n)) if n == 12 || n == 13 =>
+      Seq("-opt-inline-from:<sources>",
+        "-opt:l:inline")
+    case _ =>
+      Seq.empty
+  }
+}
+
 scriptedLaunchOpts += "-Xmx1024m"
 scriptedLaunchOpts ++= Seq("-Dplugin.version=" + version.value)
 scriptedLaunchOpts += "-debug"