diff --git a/S03-metaops/cross.t b/S03-metaops/cross.t
index f5c8ee50fe..16918b1e98 100644
--- a/S03-metaops/cross.t
+++ b/S03-metaops/cross.t
@@ -1,7 +1,7 @@
 use v6;
 
 use Test;
-plan 28;
+plan 29;
 
 # L<S03/List infix precedence/the cross operator>
 ok EVAL('<a b> X <c d>'), 'cross non-meta operator parses';
@@ -111,4 +111,10 @@ is ([1,2] X~ <a b>), '1 2a 1 2b', '[] does not flatten';
 is (1,2 X ( <a b> X "x")).join, '1a1x1b1x2a2x2b2x',
     'Nested X works';
 
+{
+    my @a = 1,2,3;
+    @a X*= 10;
+    is ~@a, '10 20 30', 'cross can modify containers on the left';
+}
+
 # vim: ft=perl6
diff --git a/S03-metaops/zip.t b/S03-metaops/zip.t
index e35e1d91f6..e492a7bfb6 100644
--- a/S03-metaops/zip.t
+++ b/S03-metaops/zip.t
@@ -1,7 +1,7 @@
 use v6;
 
 use Test;
-plan 24;
+plan 25;
 
 ok EVAL('<a b> Z <c d>'), 'zip non-meta operator parses';
 
@@ -72,4 +72,10 @@ isa_ok (1 Z 2)[0], Parcel, 'zip returns a list of parcels';
 # RT #73948
 is (1, 2 Z, 3, 4).join('|'), '1|3|2|4', 'Z, flattens in list context';
 
+{
+    my @a = 1,2,3;
+    @a Z+= 3,2,1;
+    is ~@a, '4 4 4', 'zip can modify containers on the left'
+}
+
 # vim: ft=perl6