Coloration is breaking on identifier with a dash

See

Expected result would be to have `assert-eq` colored entirely.

Reproduce the issue in the ArkScript Visual Studio Code extension by opening code containing the dashed identifier `assert-eq` and compare its highlighting with the attached screenshot. Trace the extension's syntax-coloring configuration to find where identifiers containing dashes are handled; done means `assert-eq` is colored entirely as one identifier.

索引モデルが issue の本文から書いたものです。