[notes]
This is a regression test for antlr/antlr4#561 "Issue with parser
generation in 4.2.2" https://github.com/antlr/antlr4/issues/561

[type]
Parser

[grammar]
grammar T;
<ParserPropertyMember()>
a : {<ParserPropertyCall({$parser}, "Property()")>}? ID {<writeln("\"valid\"")>}
  ;
ID : 'a'..'z'+ ;
WS : (' '|'\n') -> skip ;

[start]
a

[input]
abc

[output]
"""valid
"""