[notes]
This is a regression test for antlr/antlr4#195 "label 'label' type
mismatch with previous definition: TOKEN_LABEL!=RULE_LABEL"
https://github.com/antlr/antlr4/issues/195

[type]
Parser

[grammar]
grammar T;
start : a* EOF;
a
  : label=subrule {<writeln("$label.text")>} #One
  | label='y' {<writeln("$label.text")>} #Two
  ;
subrule : 'x';
WS : (' '|'\n') -> skip ;

[start]
start

[input]
xy

[output]
x
y