From 1de603fb2f4fd7fb796d65256daa66f13ec3f9f9 Mon Sep 17 00:00:00 2001
From: Eugene Yokota <eed3si9n@gmail.com>
Date: Thu, 21 Aug 2025 06:45:59 +0200
Subject: [PATCH] Revert "fix: Remove -Wconf:cat=unused-nowarn:s"

This reverts commit 56e83977e9c374b4f68508ca41e7aa0b7f3f8449.
---
 main/src/main/scala/sbt/Defaults.scala | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/main/src/main/scala/sbt/Defaults.scala b/main/src/main/scala/sbt/Defaults.scala
index ef757c0d5..bcd4c68f3 100644
--- a/main/src/main/scala/sbt/Defaults.scala
+++ b/main/src/main/scala/sbt/Defaults.scala
@@ -1002,6 +1002,15 @@ object Defaults extends BuildCommon {
           )
         else Def.uncached(old)
       },
+      scalacOptions := {
+        val old = scalacOptions.value
+        if (
+          sbtPlugin.value && VersionNumber(scalaVersion.value)
+            .matchesSemVer(SemanticSelector("=2.12 >=2.12.13"))
+        )
+          old ++ Seq("-Wconf:cat=unused-nowarn:s", "-Xsource:3")
+        else old
+      },
       persistJarClasspath :== true,
       classpathEntryDefinesClassVF := Def.uncached {
         val cache =