Fix for seq/array varargs crasher.

Closes SI-4024.

Author: paulp

src/compiler/scala/tools/nsc/transform/UnCurry.scala

@@ -374,7 +374,9 @@ abstract class UnCurry extends InfoTransform
           assert(toArraySym != NoSymbol)
           def getManifest(tp: Type): Tree = {
             val manifestOpt = localTyper.findManifest(tp, false)
-            if (!manifestOpt.tree.isEmpty) manifestOpt.tree
+            // Don't want bottom types getting any further than this (SI-4024)
+            if (tp.typeSymbol.isBottomClass) getManifest(AnyClass.tpe)
+            else if (!manifestOpt.tree.isEmpty) manifestOpt.tree
             else if (tp.bounds.hi ne tp) getManifest(tp.bounds.hi)
             else localTyper.getManifestTree(tree.pos, tp, false)
           }

test/files/run/t4024.scala

@@ -5,5 +5,16 @@ object Test extends App {
   val m = x.getClass.getMethod("toString")
 
   assert(m.invoke(x, (Nil: List[AnyRef]): _*) == "abc")
+
+  Test2.main(Array())
 }
 
+
+object Test2 {
+  def main(args: Array[String]): Unit = {
+    val x = "abc"
+    val m = x.getClass.getMethod("toString")
+    m.invoke(x, Nil: _*)
+    m.invoke(x, Seq(): _*)
+  }
+}