Nice. I've been looking for a solution for a while for resolving this disparity:

use 5.010;
use List::Util qw(first);

sub sub1 {
    first { return 1 } @_;
    return 2;
}

sub sub2 {
    grep { return 1 } @_;
    return 2;
}

say sub1(0);
say sub2(0);
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Given that first and grep are conceptually similar, it is counter-intuitive that return inside them means different things. While prototypes help first look like a built-in list operator, they don't help it act like one.

I've played around with Scope::Upper a little to try to come up with a resolution for this, but haven't had any luck so far. (Though as a by-product I managed to come up with returning which is pretty fun.) I wonder if last might provide some kind of solution.