Factor has them for many data-structures: http://docs.factorcode.org/content/article-syntax-literals.html http://docs.factorcode.org/content/article-syntax-lite

Factor has them for many data-structures: http://docs.factorcode.org/content/article-syntax-literals.html http://docs.factorcode.org/content/article-syntax-literals.h..., but they are simple to add in a concatenative language (they might as well have been added by a user library).