diff --git a/META.json b/META.json
index d6d54e15d..f10511f19 100644
--- a/META.json
+++ b/META.json
@@ -57,7 +57,7 @@
    "provides" : {
       "Sidef" : {
          "file" : "lib/Sidef.pm",
-         "version" : "2.11"
+         "version" : "2.12"
       },
       "Sidef::Convert::Convert" : {
          "file" : "lib/Sidef/Convert/Convert.pm"
@@ -213,6 +213,6 @@
          "http://dev.perl.org/licenses/"
       ]
    },
-   "version" : "2.11",
+   "version" : "2.12",
    "x_serialization_backend" : "JSON::PP version 2.27300"
 }
diff --git a/META.yml b/META.yml
index 8b9347c3a..1aafd9cd4 100644
--- a/META.yml
+++ b/META.yml
@@ -17,7 +17,7 @@ name: Sidef
 provides:
   Sidef:
     file: lib/Sidef.pm
-    version: '2.11'
+    version: '2.12'
   Sidef::Convert::Convert:
     file: lib/Sidef/Convert/Convert.pm
   Sidef::Deparse::Perl:
@@ -143,5 +143,5 @@ requires:
   utf8: '0'
 resources:
   license: http://dev.perl.org/licenses/
-version: '2.11'
+version: '2.12'
 x_serialization_backend: 'CPAN::Meta::YAML version 0.016'
diff --git a/TODO b/TODO
index f518b7771..afbc4192c 100644
--- a/TODO
+++ b/TODO
@@ -3,5 +3,12 @@ TODO list for Sidef
 General:
     * improve the OO system
 
+Classes:
+    * implement roles (from Perl 6) and add the `does` trait for classes
+      (http://doc.perl6.org/language/objects#Roles)
+
+Blocks:
+    * find a better way to implement the `next` and `last` statements
+
 Method/functions:
-    * implement the `is export` trait for methods (maybe)
+    * implement the `is export` trait for functions and classes (maybe)
diff --git a/lib/Sidef.pm b/lib/Sidef.pm
index 8c4359e70..ed6ab3753 100644
--- a/lib/Sidef.pm
+++ b/lib/Sidef.pm
@@ -1,7 +1,7 @@
 package Sidef {
 
     use 5.014;
-    our $VERSION = '2.11';
+    our $VERSION = '2.12';
 
     our $SPACES      = 0;    # the current number of spaces
     our $SPACES_INCR = 4;    # the number of spaces incrementor
diff --git a/lib/Sidef/Deparse/Perl.pm b/lib/Sidef/Deparse/Perl.pm
index 673626cef..fc1d52bda 100644
--- a/lib/Sidef/Deparse/Perl.pm
+++ b/lib/Sidef/Deparse/Perl.pm
@@ -954,12 +954,15 @@ HEADER
             my $raddr = refaddr($obj->{gather});
             $code = "do { push \@_$raddr," . $self->deparse_args($obj->{expr}) . "; \$_$raddr\[-1] }";
         }
-        elsif ($ref eq 'Sidef::Types::Block::For') {
-            ## ok
-        }
         elsif ($ref eq 'Sidef::Types::Block::Try') {
             $code = $ref . '->new';
         }
+        elsif ($ref eq 'Sidef::Variable::Ref') {
+            ## ok
+        }
+        elsif ($ref eq 'Sidef::Types::Block::For') {
+            ## ok
+        }
         elsif ($ref eq 'Sidef::Types::Block::Break') {
             $code = 'last';
         }