1 files changed, 2 insertions, 0 deletions
diff --git a/dobble.pl b/dobble.pl
index d219351..5040d7a 100644..100755
--- a/dobble.pl
+++ b/dobble.pl
@@ -10,6 +10,7 @@ use open ':std','utf8';
 
 package FiniteProjectivePlane {
     use Moo;
+    use experimental 'signatures';
 
     has mod => (is=>'ro',required=>1);
 
@@ -55,6 +56,7 @@ package FiniteProjectivePlane {
 
 package CardsTable {
     use Moo;
+    use experimental 'signatures';
 
     has symbols => (is=>'lazy');
     has _symbol_for => (is=>'ro',default=>sub{ +{} });