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      1 lexer grammar IDLexer;
      2 options { language = Perl5; }
      3 
      4 ID  :   ('a'..'z'|'A'..'Z')+ ;
      5 INT :   '0'..'9'+ ;
      6 NEWLINE:'\r'? '\n' { $self->skip(); } ;
      7 WS  :   (' '|'\t')+ { $channel = HIDDEN; } ;
      8