diff --git a/src/core/Array.pm b/src/core/Array.pm
index 280d8a1a68b..4ff5272cc22 100644
--- a/src/core/Array.pm
+++ b/src/core/Array.pm
@@ -1,11 +1,4 @@
 augment class Array {
-    our Bool multi method exists(*@indices) {
-        if !@indices.elems || (any(@indices) < 0 || any(@indices) > self.end) {
-            return False;
-        }
-        [?&] map { self[$^a] !~~ Proxy }, @indices;
-    }
-
     method at_pos($pos) {
         Q:PIR {
             .local pmc self, items
diff --git a/src/core/List.pm b/src/core/List.pm
index 39c85a98a5c..aa33fb07397 100644
--- a/src/core/List.pm
+++ b/src/core/List.pm
@@ -13,6 +13,15 @@ augment class List does Positional {
 
     method Str() { self.join(' ') }
 
+    multi method exists(*@indices) {
+        return False unless @indices;
+        while @indices && @indices.shift -> $key {
+            return False if $key < 0
+                || !pir::exists__IQi(self!fill($key+1), $key);
+        }
+        True;
+    }
+
     multi method fmt($format = '%s', $separator = ' ') {
         self.map({ .fmt($format) }).join($separator);
     }