Collect all local class definitions

Inline accessor was generated correctly and added at the end of the class.
Then transforming `bar` the `foo$inline` method was not collected yet.

Fixes #14373

Author: nicolasstucki

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

@@ -149,6 +149,11 @@ abstract class TreeMapWithStages(@constructorOnly ictx: Context) extends TreeMap
         case (_:Import | _:Export) =>
           tree
 
+        case _: Template =>
+          val last = enteredSyms
+          tree.symbol.owner.info.decls.foreach(markSymbol)
+          mapOverTree(last)
+
         case _ =>
           markDef(tree)
           mapOverTree(enteredSyms)

tests/pos-macros/i14373.scala

@@ -0,0 +1,10 @@
+import scala.quoted._
+trait Foo
+object Foo {
+  def apply_impl(using Quotes): Expr[Any] = '{
+    new Foo {
+      private def foo: String = ???
+      def bar: Any = ${ '{ foo }; ??? }
+    }
+  }
+}