Avoid stackoverflow in bootstrap test

tests/run/t10594.scala

Author: liufengyun

compiler/src/dotty/tools/dotc/ast/Trees.scala

@@ -1379,11 +1379,13 @@ object Trees {
       // Ties the knot of the traversal: call `foldOver(x, tree))` to dive in the `tree` node.
       def apply(x: X, tree: Tree)(using Context): X
 
-      def apply(x: X, trees: List[Tree])(using Context): X = trees match
-        case tree :: rest =>
-          apply(apply(x, tree), rest)
-        case Nil =>
-          x
+      def apply(x: X, trees: List[Tree])(using Context): X =
+        var acc = x
+        var list = trees
+        while (!list.isEmpty) do
+          acc = apply(acc, list.head)
+          list = list.tail
+        acc
 
       def foldOver(x: X, tree: Tree)(using Context): X =
         if (tree.source != ctx.source && tree.source.exists)