diff --git a/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/ConvertToNewScala3Syntax.scala b/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/ConvertToNewScala3Syntax.scala
index ac78ce659c..2606a3e438 100644
--- a/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/ConvertToNewScala3Syntax.scala
+++ b/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/ConvertToNewScala3Syntax.scala
@@ -30,6 +30,7 @@ private class ConvertToNewScala3Syntax(ftoks: FormatTokens)
 
   override def onToken(implicit
       ft: FormatToken,
+      session: Session,
       style: ScalafmtConfig
   ): Option[Replacement] = Option {
     val flag = style.rewrite.scala3.newSyntax
@@ -108,6 +109,7 @@ private class ConvertToNewScala3Syntax(ftoks: FormatTokens)
 
   override def onRight(left: Replacement, hasFormatOff: Boolean)(implicit
       ft: FormatToken,
+      session: Session,
       style: ScalafmtConfig
   ): Option[(Replacement, Replacement)] = Option {
     def nextRight = ftoks.nextNonComment(ftoks.next(ft)).right
diff --git a/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/FormatTokensRewrite.scala b/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/FormatTokensRewrite.scala
index ee5a6b2fdb..511ba239ec 100644
--- a/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/FormatTokensRewrite.scala
+++ b/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/FormatTokensRewrite.scala
@@ -117,9 +117,8 @@ class FormatTokensRewrite(
    * - for standalone tokens, simply invoke the rule and record any rewrites
    */
   private def getRewrittenTokens: Iterable[Replacement] = {
-    implicit val claimed = new mutable.HashMap[Int, Rule]()
-    def claimedRule(implicit ft: FormatToken) = claimed.get(ft.meta.idx)
-    implicit val tokens = new mutable.ArrayBuffer[Replacement]()
+    implicit val session: Session = new Session
+    val tokens = session.tokens
     val leftDelimIndex = new mutable.ListBuffer[(Int, Option[Rule])]()
     val formatOffStack = new mutable.ListBuffer[Boolean]()
     arr.foreach { implicit ft =>
@@ -131,7 +130,7 @@ class FormatTokensRewrite(
           val ruleOpt =
             if (formatOff) None
             else
-              claimedRule match {
+              session.claimedRule match {
                 case x @ Some(rule) => if (applyRule(rule)) x else None
                 case _ => applyRules
               }
@@ -145,7 +144,8 @@ class FormatTokensRewrite(
             formatOffStack.update(0, true)
           val replacement = ruleOpt match {
             case Some(rule)
-                if !ft.meta.formatOff && claimedRule.forall(_ eq rule) =>
+                if !ft.meta.formatOff &&
+                  session.claimedRule.forall(_ eq rule) =>
               implicit val style = styleMap.at(ft.right)
               if (rule.enabled) rule.onRight(tokens(ldelimIdx), formatOff)
               else None
@@ -178,20 +178,18 @@ class FormatTokensRewrite(
 
   private def applyRules(implicit
       ft: FormatToken,
-      claimed: mutable.HashMap[Int, Rule],
-      tokens: mutable.ArrayBuffer[Replacement]
+      session: Session
   ): Option[Rule] = {
     implicit val style = styleMap.at(ft.right)
-    FormatTokensRewrite.applyRules(rules)
+    session.applyRules(rules)
   }
 
   private def applyRule(rule: Rule)(implicit
       ft: FormatToken,
-      claimed: mutable.HashMap[Int, Rule],
-      tokens: mutable.ArrayBuffer[Replacement]
+      session: Session
   ): Boolean = {
     implicit val style = styleMap.at(ft.right)
-    FormatTokensRewrite.applyRule(rule)
+    session.applyRule(rule)
   }
 
 }
@@ -210,11 +208,13 @@ object FormatTokensRewrite {
     // act on or modify only ft.right; process standalone or open (left) delim
     def onToken(implicit
         ft: FormatToken,
+        session: Session,
         style: ScalafmtConfig
     ): Option[Replacement]
     // act on or modify only ft.right; process close (right) delim
     def onRight(left: Replacement, hasFormatOff: Boolean)(implicit
         ft: FormatToken,
+        session: Session,
         style: ScalafmtConfig
     ): Option[(Replacement, Replacement)]
   }
@@ -239,6 +239,39 @@ object FormatTokensRewrite {
     else new FormatTokensRewrite(ftoks, styleMap, rules).rewrite
   }
 
+  private[rewrite] class Session {
+    private implicit val implicitSession: Session = this
+    private val claimed = new mutable.HashMap[Int, Rule]()
+    private[FormatTokensRewrite] val tokens =
+      new mutable.ArrayBuffer[Replacement]()
+
+    def claimedRule(implicit ft: FormatToken): Option[Rule] =
+      claimed.get(ft.meta.idx)
+
+    private[FormatTokensRewrite] def applyRule(
+        rule: Rule
+    )(implicit ft: FormatToken, style: ScalafmtConfig): Boolean =
+      rule.enabled && (rule.onToken match {
+        case Some(repl) =>
+          repl.claim.foreach { claimed.getOrElseUpdate(_, rule) }
+          tokens.append(repl)
+          true
+        case _ => false
+      })
+
+    private[FormatTokensRewrite] def applyRules(
+        rules: Seq[Rule]
+    )(implicit ft: FormatToken, style: ScalafmtConfig): Option[Rule] = {
+      @tailrec
+      def iter(remainingRules: Seq[Rule]): Option[Rule] = remainingRules match {
+        case r +: rs => if (applyRule(r)) Some(r) else iter(rs)
+        case _ => None
+      }
+      iter(rules)
+    }
+
+  }
+
   private[rewrite] class Replacement(
       val ft: FormatToken,
       val how: ReplacementType,
@@ -313,38 +346,4 @@ object FormatTokensRewrite {
     }
   }
 
-  private def onReplacement(repl: Replacement, rule: Rule)(implicit
-      claimed: mutable.HashMap[Int, Rule],
-      tokens: mutable.ArrayBuffer[Replacement]
-  ): Unit = {
-    repl.claim.foreach { claimed.getOrElseUpdate(_, rule) }
-    tokens.append(repl)
-  }
-
-  private def applyRule(rule: Rule)(implicit
-      ft: FormatToken,
-      style: ScalafmtConfig,
-      claimed: mutable.HashMap[Int, Rule],
-      tokens: mutable.ArrayBuffer[Replacement]
-  ): Boolean =
-    rule.enabled && {
-      val res = rule.onToken
-      res.foreach(onReplacement(_, rule))
-      res.isDefined
-    }
-
-  private def applyRules(rules: Seq[Rule])(implicit
-      ft: FormatToken,
-      style: ScalafmtConfig,
-      claimed: mutable.HashMap[Int, Rule],
-      tokens: mutable.ArrayBuffer[Replacement]
-  ): Option[Rule] = {
-    @tailrec
-    def iter(remainingRules: Seq[Rule]): Option[Rule] = remainingRules match {
-      case r +: rs => if (applyRule(r)) Some(r) else iter(rs)
-      case _ => None
-    }
-    iter(rules)
-  }
-
 }
diff --git a/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/PreferCurlyFors.scala b/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/PreferCurlyFors.scala
index 350d6dacd3..2fa1d6260e 100644
--- a/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/PreferCurlyFors.scala
+++ b/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/PreferCurlyFors.scala
@@ -61,6 +61,7 @@ private class PreferCurlyFors(ftoks: FormatTokens)
 
   override def onToken(implicit
       ft: FormatToken,
+      session: Session,
       style: ScalafmtConfig
   ): Option[Replacement] = Option {
     ft.right match {
@@ -91,6 +92,7 @@ private class PreferCurlyFors(ftoks: FormatTokens)
 
   override def onRight(left: Replacement, hasFormatOff: Boolean)(implicit
       ft: FormatToken,
+      session: Session,
       style: ScalafmtConfig
   ): Option[(Replacement, Replacement)] =
     ft.right match {
diff --git a/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RedundantBraces.scala b/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RedundantBraces.scala
index 959c32870c..ada3783c55 100644
--- a/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RedundantBraces.scala
+++ b/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RedundantBraces.scala
@@ -70,6 +70,7 @@ class RedundantBraces(ftoks: FormatTokens) extends FormatTokensRewrite.Rule {
 
   override def onToken(implicit
       ft: FormatToken,
+      session: Session,
       style: ScalafmtConfig
   ): Option[Replacement] = Option {
     ft.right match {
@@ -81,6 +82,7 @@ class RedundantBraces(ftoks: FormatTokens) extends FormatTokensRewrite.Rule {
 
   override def onRight(left: Replacement, hasFormatOff: Boolean)(implicit
       ft: FormatToken,
+      session: Session,
       style: ScalafmtConfig
   ): Option[(Replacement, Replacement)] = Option {
     ft.right match {
@@ -133,6 +135,7 @@ class RedundantBraces(ftoks: FormatTokens) extends FormatTokensRewrite.Rule {
 
   private def onLeftBrace(implicit
       ft: FormatToken,
+      session: Session,
       style: ScalafmtConfig
   ): Replacement = {
     onLeftBrace(ft.meta.rightOwner)
@@ -141,6 +144,7 @@ class RedundantBraces(ftoks: FormatTokens) extends FormatTokensRewrite.Rule {
   @tailrec
   private def onLeftBrace(owner: Tree)(implicit
       ft: FormatToken,
+      session: Session,
       style: ScalafmtConfig
   ): Replacement = {
     owner match {
@@ -285,9 +289,11 @@ class RedundantBraces(ftoks: FormatTokens) extends FormatTokensRewrite.Rule {
       case _ => false
     }
 
-  private def processBlock(
-      b: Term.Block
-  )(implicit ft: FormatToken, style: ScalafmtConfig): Boolean =
+  private def processBlock(b: Term.Block)(implicit
+      ft: FormatToken,
+      session: Session,
+      style: ScalafmtConfig
+  ): Boolean =
     (ft.right match {
       case lb: Token.LeftBrace =>
         b.tokens.headOption.contains(lb) && b.tokens.last.is[Token.RightBrace]
@@ -327,7 +333,7 @@ class RedundantBraces(ftoks: FormatTokens) extends FormatTokensRewrite.Rule {
 
   private def okToRemoveBlock(
       b: Term.Block
-  )(implicit style: ScalafmtConfig): Boolean = {
+  )(implicit style: ScalafmtConfig, session: Session): Boolean = {
     b.parent.exists {
 
       case p: Case =>
@@ -425,7 +431,7 @@ class RedundantBraces(ftoks: FormatTokens) extends FormatTokensRewrite.Rule {
   /** Some blocks look redundant but aren't */
   private def shouldRemoveSingleStatBlock(
       b: Term.Block
-  )(implicit style: ScalafmtConfig): Boolean =
+  )(implicit style: ScalafmtConfig, session: Session): Boolean =
     getSingleStatIfLineSpanOk(b).exists { stat =>
       @tailrec
       def checkParent(tree: Tree): Boolean = tree match {
@@ -442,7 +448,7 @@ class RedundantBraces(ftoks: FormatTokens) extends FormatTokensRewrite.Rule {
               ftoks.matchingOpt(x) match {
                 case Some(y) if y ne stat.tokens.last =>
                   redundantParensFunc.exists { parensRule =>
-                    parensRule.onToken(ftoks(x, -1), style).exists {
+                    parensRule.onToken(ftoks(x, -1), session, style).exists {
                       _.how eq ReplacementType.Remove
                     }
                   }
diff --git a/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RedundantParens.scala b/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RedundantParens.scala
index 99713d6b47..3fc07a1e4f 100644
--- a/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RedundantParens.scala
+++ b/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RedundantParens.scala
@@ -71,6 +71,7 @@ class RedundantParens(ftoks: FormatTokens) extends FormatTokensRewrite.Rule {
 
   override def onToken(implicit
       ft: FormatToken,
+      session: Session,
       style: ScalafmtConfig
   ): Option[Replacement] =
     ft.right match {
@@ -83,6 +84,7 @@ class RedundantParens(ftoks: FormatTokens) extends FormatTokensRewrite.Rule {
 
   override def onRight(left: Replacement, hasFormatOff: Boolean)(implicit
       ft: FormatToken,
+      session: Session,
       style: ScalafmtConfig
   ): Option[(Replacement, Replacement)] =
     ft.right match {
diff --git a/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RemoveEmptyDocstrings.scala b/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RemoveEmptyDocstrings.scala
index 3d76e3261a..2d590388e6 100644
--- a/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RemoveEmptyDocstrings.scala
+++ b/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RemoveEmptyDocstrings.scala
@@ -21,6 +21,7 @@ object RemoveEmptyDocstrings
 
   override def onToken(implicit
       ft: FormatToken,
+      session: Session,
       style: ScalafmtConfig
   ): Option[Replacement] = {
     val skip = ft.right.is[Token.Comment] &&
@@ -30,6 +31,7 @@ object RemoveEmptyDocstrings
 
   override def onRight(lt: Replacement, hasFormatOff: Boolean)(implicit
       ft: FormatToken,
+      session: Session,
       style: ScalafmtConfig
   ): Option[(Replacement, Replacement)] = None
 
diff --git a/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RemoveScala3OptionalBraces.scala b/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RemoveScala3OptionalBraces.scala
index 32389590f5..715b9ad1e1 100644
--- a/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RemoveScala3OptionalBraces.scala
+++ b/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RemoveScala3OptionalBraces.scala
@@ -36,6 +36,7 @@ private class RemoveScala3OptionalBraces(ftoks: FormatTokens)
 
   override def onToken(implicit
       ft: FormatToken,
+      session: Session,
       style: ScalafmtConfig
   ): Option[Replacement] = Option {
     ft.right match {
@@ -67,6 +68,7 @@ private class RemoveScala3OptionalBraces(ftoks: FormatTokens)
 
   override def onRight(left: Replacement, hasFormatOff: Boolean)(implicit
       ft: FormatToken,
+      session: Session,
       style: ScalafmtConfig
   ): Option[(Replacement, Replacement)] =
     ft.right match {
diff --git a/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RewriteTrailingCommas.scala b/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RewriteTrailingCommas.scala
index 9ed755ebb5..dde0d91c4f 100644
--- a/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RewriteTrailingCommas.scala
+++ b/scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RewriteTrailingCommas.scala
@@ -34,6 +34,7 @@ private class RewriteTrailingCommas(ftoks: FormatTokens)
 
   override def onToken(implicit
       ft: FormatToken,
+      session: Session,
       style: ScalafmtConfig
   ): Option[Replacement] = {
     val ok = ft.right.is[Token.Comma] && {
@@ -59,6 +60,7 @@ private class RewriteTrailingCommas(ftoks: FormatTokens)
 
   override def onRight(lt: Replacement, hasFormatOff: Boolean)(implicit
       ft: FormatToken,
+      session: Session,
       style: ScalafmtConfig
   ): Option[(Replacement, Replacement)] = None