Make boundary.apply a regular inline

Drop the `transparent` in order to curcumvent #16609

Author: odersky

compiler/src/dotty/tools/dotc/transform/DropBreaks.scala

@@ -90,7 +90,7 @@ class DropBreaks extends MiniPhase:
      *
      *      { val local: Label[...] = ...; <LabelTry(local, body)> }
      */
-    def unapply(tree: Tree)(using Context): Option[(Symbol, Tree)] = tree match
+    def unapply(tree: Tree)(using Context): Option[(Symbol, Tree)] = stripTyped(tree) match
       case Block((vd @ ValDef(nme.local, _, _)) :: Nil, LabelTry(caughtAndRhs))
       if vd.symbol.info.isRef(defn.LabelClass) && vd.symbol == caughtAndRhs._1 =>
         Some(caughtAndRhs)

library/src/scala/util/boundary.scala

@@ -30,7 +30,7 @@ object boundary:
    *  breaks associated with that label and return their results instead of
    *  `body`'s result.
    */
-  transparent inline def apply[T <: R, R](inline body: Label[T] ?=> R): R =
+  inline def apply[T <: R, R](inline body: Label[T] ?=> R): R =
     val local = Label[T]()
     try body(using local)
     catch case ex: Break[T] @unchecked =>