Hi all.
I had a toy grammer,
grammar cub;
prog: (command)+ ;
command : (function |var)+;
function : (Letter)+',';
var : (Letter)+;
Letter : 'A'..'Z';
WS : ( '\t'|' '|'\r'|'\n'|'\u000C' )+ { $channel = HIDDEN; } ;
I expected it can recognise text like:
Funone,varone
Funtwo,vartwo
Here is a tool run:
[11:14:04] warning(200): cub.g:4:25: Decision can match input such as
"Letter" using multiple alternatives: 1, 2, 3
As a result, alternative(s) 3,2 were disabled for that input
[11:14:04] error(201): cub.g:4:25: The following alternatives can never be
matched: 2
I didn't know who can never be matched, and why?
Regard,
langee
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