SI-1459 two bridges for impl of java generic vararg method

A Scala method that implements a generic, Java-defined
varargs method, needs two bridges:
  - to convert the collections for the repeated parameters (VBRIDGE)
  - to bridge the generics gap (BRIDGE)

Refchecks emits the varargs "bridges", and erasure takes care
of the other gap. Because a VBRIDGE was also an ARTIFACT,
it was wrongly considered inert with respect to erasure,
because `OverridingPairs` by default excluded artifacts.

Removed the artifact flag from those VBRIDGES, so that they
qualify for a real bridge. It would also work to include
VBRIDGE methods that are artifacts in BridgesCursor.

3 files changed, 18 insertions, 0 deletions

diff --git a/test/files/run/t1459generic/Impl.scala b/test/files/run/t1459generic/Impl.scala
new file mode 100644
index 0000000000..9234e70456
--- /dev/null
+++ b/test/files/run/t1459generic/Impl.scala
@@ -0,0 +1,4 @@
+class Impl extends VarargGeneric[String] {
+  def genericOne(x: String, arg: String): String = x + arg
+  def genericVar(x: String, args: String*): String = x + args.head
+}
diff --git a/test/files/run/t1459generic/Test.java b/test/files/run/t1459generic/Test.java
new file mode 100644
index 0000000000..a97158796b
--- /dev/null
+++ b/test/files/run/t1459generic/Test.java
@@ -0,0 +1,10 @@
+public class Test {
+  public static void main(String[] args) throws Exception {
+    VarargGeneric vg = new Impl();
+    System.out.println(vg.genericOne("a", "b"));
+    System.out.println(vg.genericVar("a", "b"));
+    // should not result in java.lang.AbstractMethodError: Impl.genericVar(Ljava/lang/Object;[Ljava/lang/String;)Ljava/lang/String;
+    // --> genericVar needs a varargs bridge (scala -> java varargs) and a standard generics bridge
+    // (for comparison, including genericOne, which needs only a generics bridge)
+  }
+}
diff --git a/test/files/run/t1459generic/VarargGeneric.java b/test/files/run/t1459generic/VarargGeneric.java
new file mode 100644
index 0000000000..c043e39b40
--- /dev/null
+++ b/test/files/run/t1459generic/VarargGeneric.java
@@ -0,0 +1,4 @@
+public interface VarargGeneric<T> {
+  String genericOne(T x, String args);
+  String genericVar(T x, String... args);
+}