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## for right-associative ops:
lower_prec_expr : higher_prec_expr lower_prec_op lower_prec_expr
...
lower_prec_expr : lower_prec_expr lower_prec_op higher_prec_expr
                | higher_prec expr

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use Parse::RecDescent;
use Data::Dumper;
...
foo == bar || baz < bar
foo == bar || baz < bar || foo && bar
(foo || bar) || baz