Adds example for anon class, closes #1655

doc/Language/variables.pod6

@@ -629,7 +629,18 @@ instance for classes or even sigilless variables.
 
 Since these symbols are not installed in the scope, they can't be used by name.
 They are useful, however, if they need to be assigned to an external variable
-and they need to know their name themselves.
+and they need to know their own name, but this can be retrieved using
+introspection.
+
+=for code
+my $anon-class = anon class {
+    has $.bar;
+    method equal( ::?CLASS $foo ) {
+      return $foo.bar == $.bar;
+    }
+};
+say $anon-class.new( :3bar).equal( $anon-class.new( :3bar ) );
+