Error message for super calls to indirect java parent interfaces

Super calls to indirect java parent interfaces cannot be emitted, an
error message is emitted during SuperAccessors.

The error message was missing if the super call was non-qualified,
resulting in an assertion failure in the backend.

1 files changed, 12 insertions, 0 deletions

diff --git a/test/junit/scala/lang/traits/BytecodeTest.scala b/test/junit/scala/lang/traits/BytecodeTest.scala
index cf658288c4..5c01ebc6b2 100644
--- a/test/junit/scala/lang/traits/BytecodeTest.scala
+++ b/test/junit/scala/lang/traits/BytecodeTest.scala
@@ -366,6 +366,18 @@ class BytecodeTest extends BytecodeTesting {
     val ins5 = getMethod(c5, "m").instructions
     assert(ins5 contains Invoke(INVOKESTATIC, "AS", "m$", "(LAS;)I", true), ins5.stringLines)
   }
+
+  @Test
+  def sd224(): Unit = {
+    val jCode = List("interface T { default int f() { return 1; } }" -> "T.java")
+    val code =
+      """trait U extends T
+        |class C extends U { def t = super.f }
+      """.stripMargin
+    val msg = "unable to emit super call unless interface T (which declares method f) is directly extended by class C"
+    val cls = compileClasses(code, jCode, allowMessage = _.msg contains msg)
+    assertEquals(cls, Nil)
+  }
 }
 
 object invocationReceiversTestCode {