grammar-test.pl6

grammar G {
    rule TOP { ^ \n* <definition>* \n $ }

    rule definition {
         'block' '{' \n* <line>+ % "\n" \n* '}'
    }

    rule line {
        'line' +% "&"
    }
    
    token ws { \h* }
}

my $text = q<
block {
   line
   line & line
   line
}
>;
say G.subparse($text);