[notes]
This test is meant to test the expected solution to antlr/antlr4#42.
https://github.com/antlr/antlr4/issues/42

[type]
Parser

[grammar]
grammar T;
s : stmt EOF ;
stmt : ifStmt | ID;
ifStmt : 'if' ID stmt ('else' stmt | { <LANotEquals("1", {T<ParserToken("Parser", "ELSE")>})> }?);
ELSE : 'else';
ID : [a-zA-Z]+;
WS : [ \\n\\t]+ -> skip;

[start]
s

[input]
if x if x a else b