Fix infinite recursion in CapToFresh

Author: noti0na1

compiler/src/dotty/tools/dotc/cc/Capability.scala

@@ -898,9 +898,9 @@ object Capabilities:
         case t @ AnnotatedType(parent, ann) =>
           val parent1 = this(parent)
           if ann.symbol.isRetains && ann.tree.toCaptureSet.containsCap then
-            // TODO: this can cause infinite recursion in some cases during printing
+            // Applying `this` can cause infinite recursion in some cases during printing.
             // scalac -Xprint:all tests/pos/i23885/S_1.scala tests/pos/i23885/S_2.scala
-            this(CapturingType(parent1, ann.tree.toCaptureSet))
+            mapOver(CapturingType(parent1, ann.tree.toCaptureSet))
           else
             t.derivedAnnotatedType(parent1, ann)
         case defn.RefinedFunctionOf(_) =>