In the tests, be more clear about what lexer generated an error token
In the tests, be more clear about what lexer generated an error token

--HG--
branch : trunk

nex3/pygments,nex3/pygments,nex3/pygments,nex3/pygments,nex3/pygments,nex3/pygments,nex3/pygments,nex3/pygments,nex3/pygments,nex3/pygments,nex3/pygments