Add test case to reproduce reflective access issue

Author: olafurpg

tests/minimized-scala/src/main/scala/minimized/ReflectiveCall.scala

@@ -0,0 +1,12 @@
+package minimized
+
+import scala.language.reflectiveCalls
+
+class ReflectiveCall {
+  // Reproduction for https://github.com/scalameta/scalameta/issues/2788
+  val a =
+    new {
+      val b = 1
+    }
+  println(a.b)
+}

tests/snapshots/src/main/generated/minimized/ReflectiveCall.scala

@@ -0,0 +1,23 @@
+package minimized
+//      ^^^^^^^^^ definition minimized/
+
+import scala.language.reflectiveCalls
+//     ^^^^^ reference scala/
+//           ^^^^^^^^ reference scala/language.
+//                    ^^^^^^^^^^^^^^^ reference scala/language.reflectiveCalls.
+
+class ReflectiveCall {
+//    ^^^^^^^^^^^^^^ definition minimized/ReflectiveCall# class ReflectiveCall
+//                    definition minimized/ReflectiveCall#`<init>`(). def this()
+  // Reproduction for https://github.com/scalameta/scalameta/issues/2788
+  val a =
+//    ^ definition minimized/ReflectiveCall#a. val a: { val b: Int }
+    new {
+//       definition local0 final class $anon
+      val b = 1
+//        ^ definition local1 val b: Int
+    }
+  println(a.b)
+//^^^^^^^ reference scala/Predef.println(+1).
+//        ^ reference minimized/ReflectiveCall#a.
+}