Ruby: Non-ASCII Method Names Not Recognised

[guest]

Ruby 1.9 allows method names to include non-ASCII characters with the following caveats:

* The characters must be valid in the file's source encoding.

* A legal method name that does not end with '!', '?', or '=' may have one of these characters appended.

* The ASCII punctuation characters of which operator methods consist (e.g. [*%&^`~+-/\[<>=]) must not appear in any other permutation, with the exception of the above case.

Pygments does not recognise such method names, lexing the first non-ASCII character as an error. Examples of unrecognised method names are given in http://pygments.org/demo/3147/ .