Merge pull request #15247 from dotty-staging/fix-15213

Transform RHS of captured assignment reference

Author: bishabosha

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

@@ -294,7 +294,7 @@ class Splicing extends MacroTransform:
         reflect.asExpr(tree.tpe)(
           reflect.Assign(
             reflect.asTerm(capturedTerm(tree.lhs)),
-            reflect.asTerm(quoted(tree.rhs))
+            reflect.asTerm(quoted(transform(tree.rhs)))
           )
         )
       }

tests/pos-macros/i15213.scala

@@ -0,0 +1,9 @@
+import scala.quoted.*
+
+def map[T](arr: Expr[Array[T]], f: Expr[T] => Expr[Unit])(using Type[T], Quotes): Expr[Unit] = '{}
+
+def sum(arr: Expr[Array[Int]])(using Quotes): Expr[Int] = '{
+  var sum = 0
+  ${ map(arr, x => '{sum += $x}) }
+  sum
+}