SI-9097 Consolidate test

`pos` test is subsumed by `run`.

Author: som-snytt

test/files/pos/t9097.flags

@@ -1,9 +1,16 @@
 import scala.tools.partest._
 import java.io.{Console => _, _}
 
-object Test extends DirectTest {
+object Test extends StoreReporterDirectTest {
 
-  override def extraSettings: String = "-usejavacp -Ydelambdafy:method -Xprint:delambdafy -d " + testOutput.path
+  override def extraSettings: String = List(
+    "-usejavacp",
+    "-Xfatal-warnings",
+    "-Ybackend:GenBCode",
+    "-Ydelambdafy:method",
+    "-Xprint:delambdafy",
+    s"-d ${testOutput.path}"
+  ) mkString " "
 
   override def code = """package o
                         |package a {
@@ -19,6 +26,7 @@ object Test extends DirectTest {
   override def show(): Unit = {
     val baos = new java.io.ByteArrayOutputStream()
     Console.withOut(baos)(Console.withErr(baos)(compile()))
+    assert(!storeReporter.hasErrors, message = filteredInfos map (_.msg) mkString "; ")
     val out = baos.toString("UTF-8")
     // was 2 before the fix, the two PackageDefs for a would both contain the ClassDef for the closure
     assert(out.lines.count(_ contains "class hihi$1") == 1, out)