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#!/usr/bin/pugs
use v6;
...
    @stack.elems == 1 or die "Invalid stack:[@stack[]]\n";
    return @stack[0];
}

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1;0 eric256@feather:~/tests$ pugs rpn_calc.p6
Match 1:
...

test1 == 1 2 +  == 3
test2 == 1 2 3 + -  == -4