For `Kotlin <http://confluence.jetbrains.net/display/Kotlin/>`_ source code.
Additional options accepted:
Determines which Unicode characters this lexer allows for identifiers. The possible values are: * ``none`` -- only the ASCII letters and numbers are allowed. This is the fastest selection. * ``basic`` -- all Unicode characters from the specification except category ``Lo`` are allowed. * ``full`` -- all Unicode characters as specified in the C# specs are allowed. Note that this means a considerable slowdown since the ``Lo`` category has more than 40,000 characters in it! The default value is ``basic``.
*New in Pygments 1.5.*