[type]
Lexer

[grammar]
lexer grammar L;
ACTION : '{' (ACTION | ~[{}])* '}';
WS : [ \r\n\t]+ -> skip;

[input]
{ { }

[output]
"""[@0,5:4='<EOF>',<-1>,1:5]
"""

[errors]
"""line 1:0 token recognition error at: '{ { }'
"""