Reposition tasty reflect nodes with no position

Author: nicolasstucki

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

@@ -40,9 +40,19 @@ object Splicer {
     case _ =>
       val interpreter = new Interpreter(pos, classLoader)
       try {
+        // TODO try to apply position directly in the TASTy reflect constructors
+        val positioner = new TreeMap() {
+          override def transform(tree: tpd.Tree)(implicit ctx: Context): tpd.Tree = {
+            val tree1 =
+              if (tree.span.exists) tree
+              else tree.withSpan(pos.span) // TODO change the source if needed: tree.withPos(pos)
+            super.transform(tree1)
+          }
+        }
         // Some parts of the macro are evaluated during the unpickling performed in quotedExprToTree
         val interpretedExpr = interpreter.interpret[scala.quoted.Expr[Any]](tree)
-        interpretedExpr.fold(tree)(x => PickledQuotes.quotedExprToTree(x))
+        val interpretedTree = interpretedExpr.fold(tree)(x => positioner.transform(PickledQuotes.quotedExprToTree(x)))
+        interpretedTree
       }
       catch {
         case ex: scala.quoted.QuoteError =>