From 2d07bd558b994468780b40b90fba20f1f265b9be Mon Sep 17 00:00:00 2001
From: odersky <odersky@gmail.com>
Date: Sun, 1 Oct 2023 18:23:30 +0200
Subject: [PATCH] Add @sharable annotation to global counter

---
 compiler/src/dotty/tools/dotc/cc/CaptureRoot.scala | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/compiler/src/dotty/tools/dotc/cc/CaptureRoot.scala b/compiler/src/dotty/tools/dotc/cc/CaptureRoot.scala
index 6bab3d331bb7..6913740307ae 100644
--- a/compiler/src/dotty/tools/dotc/cc/CaptureRoot.scala
+++ b/compiler/src/dotty/tools/dotc/cc/CaptureRoot.scala
@@ -9,12 +9,13 @@ import printing.Showable
 import util.SimpleIdentitySet
 import Decorators.i
 import scala.annotation.constructorOnly
+import scala.annotation.internal.sharable
 
 type CaptureRoot = TermRef | CaptureRoot.Var
 
 object CaptureRoot:
 
-  private var nextId = 0
+  @sharable private var nextId = 0
 
   case class Var(owner: Symbol, source: Symbol)(using @constructorOnly ictx: Context) extends CaptureRef, Showable: