[notes]
https://github.com/antlr/antlr4/issues/1943

[type]
Lexer

[grammar]
lexer grammar L;
WORD   : [a-z-+]+;

[input]
word

[output]
[@0,0:3='word',<1>,1:0]
[@1,4:3='<EOF>',<-1>,1:4]