[antlr-interest] NoViableAltException this time

[Simon zack]

tried using namespace_specification to interpret the string, but the error
still shows up

I changed the code a little, but a new exception pops up

this only works when I remove the exception_info, however adding it messes
up things

[code]
grammar test;

exception_info
    :
        '.exception'
    ;

namespace_specification
    :
        ns_id1 = IDENTIFIER ('.' ns_idx = IDENTIFIER)*
        //ns_id1 = IDENTIFIER ( '.' ns_idx = IDENTIFIER)*
    ;

IDENTIFIER
    :    LETTER (LETTER|'0'..'9')*
    ;

fragment LETTER
    :    '$'
    |    'A'..'Z'
    |    'a'..'z'
    |    '_'
    ;


[/code]

thanks