diff --git a/compiler/src/dotty/tools/dotc/core/Decorators.scala b/compiler/src/dotty/tools/dotc/core/Decorators.scala
index d392a4e3079a..54faf9a41177 100644
--- a/compiler/src/dotty/tools/dotc/core/Decorators.scala
+++ b/compiler/src/dotty/tools/dotc/core/Decorators.scala
@@ -274,6 +274,9 @@ object Decorators {
             s"[cannot display due to $msg, raw string = $x]"
       case _ => String.valueOf(x).nn
 
+    /** Returns the simple class name of `x`. */
+    def className: String = getClass.getSimpleName.nn
+
   extension [T](x: T)
     def assertingErrorsReported(using Context): T = {
       assert(ctx.reporter.errorsReported)