Camelia
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=title Grammar subclass =timestamp 2012-01-01T01:02:05 =author szabgab =keywords =status show

tutorial/regex2/Add4.pm

use Add3;
grammar Add4 is Add3 {
    token operator:sym<\->    { '-' };

}

tutorial/regex2/Add4.pm.out

2 + 3 OK
2 + 4  OK
2 + 3 x exception received: Invalid value after the second operand
2 + exception received: Missing second operand
2 3 exception received: missing operator
2 - 3 OK

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Prev: Grammar that is easier to extend

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