Add regression test

Author: jchyb

tests/pos-macros/i22585/Macro.scala

@@ -0,0 +1,22 @@
+import scala.quoted.*
+
+trait Hammer[I, O] {
+  def hammer(input: I): O
+}
+
+object Hammer {
+  inline def makeProductHammerMacro[I, O](): Hammer[I, O] =
+    ${ makeProductHammerMacroImpl[I, O] }
+
+  def makeProductHammerMacroImpl[I: Type, O: Type](using Quotes): Expr[Hammer[I, O]] =
+    '{ makeHammer[I, O]() }
+
+  inline def makeHammer[S, O](): Hammer[S, O] =
+    new Hammer[S, O] {
+      lazy val (hammer: Hammer[?, Int], idx: Int) = ???
+
+      override def hammer(input: S): O = {
+        hammer.hammer(???.asInstanceOf).asInstanceOf[O]
+      }
+    }
+}

tests/pos-macros/i22585/Main.scala

@@ -0,0 +1,5 @@
+object HammerSpec {
+  case class A(x: Int)
+  case class B(x: Int)
+  Hammer.makeProductHammerMacro[A, B]()
+}