Fix owners of AsFunction applied expressions

Author: nicolasstucki

compiler/src/dotty/tools/dotc/core/quoted/PickledQuotes.scala

@@ -143,7 +143,7 @@ object PickledQuotes {
             case tree: Ident if tree.symbol == paramSym => x1Ref().withPos(tree.pos)
             case _ => super.transform(tree)
           }
-        }.transform(ddef.rhs)
+        }.transform(ddef.rhs).changeOwner(ddef.symbol, ctx.owner)
       case Block(stats, expr) =>
         val applied = rec(expr)
         if (stats.isEmpty) applied

tests/run-with-compiler/quote-ackermann-1.check

@@ -0,0 +1 @@
+125

tests/run-with-compiler/quote-ackermann-1.scala

@@ -0,0 +1,21 @@
+import scala.quoted._
+
+import dotty.tools.dotc.quoted.Toolbox._
+
+object Test {
+
+  def main(args: Array[String]): Unit = {
+    println(ackermann(3)(4).run)
+  }
+
+  def ackermann(m: Int): Expr[Int => Int] = {
+    if (m == 0) '{ n => n + 1 }
+    else '{ n =>
+      def `ackermann(m-1)`(n: Int): Int = ~ackermann(m - 1)('(n)) // Expr[Int => Int] applied to Expr[Int]
+      def `ackermann(m)`(n: Int): Int =
+        if (n == 0) `ackermann(m-1)`(1) else `ackermann(m-1)`(`ackermann(m)`(n - 1))
+      `ackermann(m)`(n)
+    }
+  }
+
+}