Fix #1644: Disallow inner classes in value classes

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/neg/valueclasses-impl-restrictions.scala b/tests/neg/valueclasses-impl-restrictions.scala
new file mode 100644
index 000000000..9f33b7e7c
--- /dev/null
+++ b/tests/neg/valueclasses-impl-restrictions.scala
@@ -0,0 +1,19 @@
+class X1(val s: String) extends AnyVal {
+  trait I2 { // error: value class may not define an inner class or trait
+   val q: String
+   def z = s + q
+  }
+}
+
+class X2(val s: String) extends AnyVal {
+  private[this] class I2(val q: String) // error: value class may not define an inner class or trait
+
+  def y(i: Int) = {
+    val i2 = new I2(i.toString)
+    i2.q + s
+  }
+}
+
+class X3(val s: String) extends AnyVal {
+  object I3 // error: value class may not define non-parameter field
+}