# New Ticket Created by "Carl Mäsak" # Please include the string: [perl #122475] # in the subject line of all future correspondence about this issue. # <URL: https://rt.perl.org/Ticket/Display.html?id=122475 >
<timotimo> m: my @a = $(1, 2, 3); say [>>+<<] @a; <camelia> rakudo-moar 3ad15f: OUTPUT«Not enough positional parameters passed; got 1 but expected 2 [...] <timotimo> m: my @a = $(1, 2, 3), $(0, 0, 0); say [>>+<<] @a; <camelia> rakudo-moar 3ad15f: OUTPUT«1 2 3» <timotimo> ^- i don't know how to formulate the bug report for this <masak> "[BUG] instance of the reduce metaop which should work with one-element list only works with two or more elements in Rakudo" <timotimo> perfect <timotimo> would you do the honors? :) * masak submits rakudobug <timotimo> thank you :) I think I agree that this is a bug, with the following reasoning: [+] accepts a list of zero, one, or many elements. The zero and one cases are special-cased, to be sure, because addition usually involves two things. But here it essentially means "sum", which can have any number of things. Similarly, [>>+<<] is also a kind of sum: in this case, it is summing the internal structures of the items in the list (which have to be of the same shape, because the >> << are pointing inwards). So the >> << restrict the shape of the items themselves, but not the number of items. So this kind of sum of one item should work, and just return that item. In that vein, the 0-elem case should also work: <masak> m: my @a; say [>>+<<] @a <camelia> rakudo-moar 3ad15f: OUTPUT«Not enough positional parameters passed; got 0 but expected 2 [...]
