Move test from pos to run

Test generated code before but fails with verify error at runtime.
Here's the message:

Exception in thread "main" java.lang.VerifyError: Bad type on operand stack
Exception Details:
  Location:
    D$.<init>()V @2: invokedynamic
  Reason:
    Type uninitializedThis (current frame, stack[1]) is not assignable to 'D$'
  Current Frame:
    bci: @2
    flags: { flagThisUninit }
    locals: { uninitializedThis }
    stack: { uninitializedThis, uninitializedThis }
  Bytecode:
    0x0000000: 2a2a ba00 1f00 00b7 0022 2ab3 0024 b1

	at Test$.main(t3048.scala:13)
	at Test.main(t3048.scala)

With the fix in last commit, test causes backend to crash with

java.lang.AssertionError: assertion failed: val <none>
	at scala.Predef$.assert(Predef.scala:165)
	at scala.tools.nsc.backend.jvm.BCodeHelpers$BCInnerClassGen$class.assertClassNotArray(BCodeHelpers.scala:214)
	at scala.tools.nsc.backend.jvm.BCodeHelpers$BCInnerClassGen$class.assertClassNotArrayNotPrimitive(BCodeHelpers.scala:219)
	at scala.tools.nsc.backend.jvm.BCodeHelpers$BCInnerClassGen$class.getClassBTypeAndRegisterInnerClass(BCodeHelpers.scala:238)
	at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.getClassBTypeAndRegisterInnerClass(BCodeSkelBuilder.scala:51)
	at scala.tools.nsc.backend.jvm.BCodeHelpers$BCInnerClassGen$class.internalName(BCodeHelpers.scala:210)

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/run/t3048.scala b/tests/run/t3048.scala
new file mode 100644
index 000000000..8762047af
--- /dev/null
+++ b/tests/run/t3048.scala
@@ -0,0 +1,17 @@
+class B
+object C extends B
+
+class F[T <: B](cons: => T) {
+  def f = cons
+}
+class F2[T <: B](cons: => T) extends F(cons)
+
+object D extends F2(C) // works
+object E extends F2(new B {})
+
+object Test {
+  def main(args: Array[String]): Unit = {
+    D.f
+    E.f
+  }
+}