Prev: Grammar that is easier to extend

Grammar subclass

Note! This site is about Perl 6.
If you are looking for a solution for Perl 5, please check out the Perl 5 tutorial.


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



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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Gabor Szabo
Written by Gabor Szabo

Published on 2012-01-01

Prev: Grammar that is easier to extend


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