In 1989 the building was heavily damaged by fire, but it has since been restored. The sequential subset of Erlang supports eager evaluation, single assignment, and dynamic typing. Ports are created with the built-in function open_port. The sequential subset of Erlang supports eager evaluation, single assignment, and dynamic typing. Atoms can contain any character if they are enclosed within single quotes and an escape convention exists which allows any character to be used within an atom.