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All the Perl that's Practical to Extract and Report

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  • I found it was actually easier to deal with the Y combinator if you implement it in terms of the U combinator, which is just your basic fixed point combinator.

    sub U {
        my $f = shift;
        sub { $f->($f, @_) };

    sub Y {
        my $f = shift;
        U(sub {
            my $h = shift;
            sub {

    I also recentl []