Apply addToSequence to blocks.

Clear generated code.
It contained 'var;' statements.

src/Web-Snippets.js

@@ -67,7 +67,6 @@ if(!$core.assert($1)){
 $2=$recv("^\x5c*"._asRegexp())._test_(name);
 if($core.assert($2)){
 name=$recv(name)._allButFirst();
-name;
 $recv(element)._attr_put_("data-snippet","*");
 } else {
 $recv(element)._removeAttr_("data-snippet");