[notes]
This test is meant to detect regressions of bug antlr/antlr4#41.
https://github.com/antlr/antlr4/issues/41

[type]
Parser

[grammar]
grammar T;
stat : ifstat | 'x';
ifstat : 'if' stat ('else' stat)?;
WS : [ \n\t]+ -> skip ;

[start]
stat

[input]
if x else x