[type]
Parser

[grammar]
grammar T;
s : {<LL_EXACT_AMBIG_DETECTION()>} a ';' a; // do 2x: once in ATN, next in DFA
a : ID {<writeln("\"alt 1\"")>}
  | ID {<writeln("\"alt 2\"")>}
  | {<False()>}? ID {<writeln("\"alt 3\"")>}
  ;
ID : 'a'..'z'+ ;
INT : '0'..'9'+;
WS : (' '|'\n') -> skip ;

[start]
s

[input]
x; y

[output]
alt 1
alt 1

[errors]
line 1:0 reportAttemptingFullContext d=0 (a), input='x'
line 1:0 reportAmbiguity d=0 (a): ambigAlts={1, 2}, input='x'
line 1:3 reportAttemptingFullContext d=0 (a), input='y'
line 1:3 reportAmbiguity d=0 (a): ambigAlts={1, 2}, input='y'

[flags]
showDiagnosticErrors