diff --git a/src/classes/Array.pir b/src/classes/Array.pir
index f6240b1..da59fab 100644
--- a/src/classes/Array.pir
+++ b/src/classes/Array.pir
@@ -1206,6 +1206,22 @@ Operator form for either repetition (when argument is an Integer), or as a short
   diff_done:
     .return (array)
 .end
+
+.sub 'infix:<<' :multi('CardinalArray',_)
+    .param pmc this
+    .param pmc that
+    this.'push'(that)
+    .return (this)
+.end
+
+.sub 'infix:<<' :multi(_,_)
+    .param pmc this
+    .param pmc that
+    $P0 = new 'CardinalArray'
+    $P0.'push'(this)
+    $P0.'push'(that)
+    .return ($P0)
+.end
     
 =item C<infix:,(...)>
 
diff --git a/t/array/mathop.t b/t/array/mathop.t
index 1d56657..be48244 100644
--- a/t/array/mathop.t
+++ b/t/array/mathop.t
@@ -1,6 +1,6 @@
 require 'Test'
 include Test
-plan 13
+plan 14
 
 a = [ 1, 2 ]
 b = [ 3, 4]
@@ -40,3 +40,6 @@ a = [1,3,5,7,8]
 b = [1,5,8,9]
 c = a & b
 is c, [1,5,8], "Array & (union)"
+
+a = [1,2] << "a" << 3 << [4,5]
+is a, [1,2,"a",3,[4,5]], "Array <<"