rust/validation.md

Fixmes:

* Fix `is_whitespace`, add more test
* Add more thorough tests for idents for XID_Start & XID_Continue
Cleanup character classes 2017-12-30 00:48:47 +03:00			`Fixmes:`

			* Fix `is_whitespace`, add more test
Lexer: underscore 2017-12-30 01:01:57 +03:00			`* Add more thorough tests for idents for XID_Start & XID_Continue`
Cleanup character classes 2017-12-30 00:48:47 +03:00