diff --git a/src/dotty/tools/dotc/ast/TreeInfo.scala b/src/dotty/tools/dotc/ast/TreeInfo.scala
index 2f6b6b914bab..6401c01c1273 100644
--- a/src/dotty/tools/dotc/ast/TreeInfo.scala
+++ b/src/dotty/tools/dotc/ast/TreeInfo.scala
@@ -33,7 +33,7 @@ trait TreeInfo[T >: Untyped <: Type] { self: Trees.Instance[T] =>
   }
 
   def isOpAssign(tree: Tree) = unsplice(tree) match {
-    case Apply(fn, _ :: Nil) =>
+    case Apply(fn, _ :: _) =>
       unsplice(fn) match {
         case Select(_, name) if name.isOpAssignmentName => true
         case _ => false
diff --git a/tests/pending/run/colltest1.check b/tests/run/colltest1.check
similarity index 100%
rename from tests/pending/run/colltest1.check
rename to tests/run/colltest1.check
diff --git a/tests/pending/run/colltest1.scala b/tests/run/colltest1.scala
similarity index 100%
rename from tests/pending/run/colltest1.scala
rename to tests/run/colltest1.scala