[type]
Lexer

[grammar]
lexer grammar L;
I : (~[ab \\n]|'a')  {<writeln("\"I\"")>} ;
WS : [ \n\\u000D]+ -> skip ;

[input]
a x

[output]
I
I
[@0,0:0='a',<1>,1:0]
[@1,2:2='x',<1>,1:2]
[@2,3:2='<EOF>',<-1>,1:3]