In #8, you have a superfluous assignment of the closure. Instead of 

my $compress = do {
    my $previous;
    $compress = sub ($x) { ... }
};

[download]

You could just arrange for the sub definition to be the last evaluated thing inside the do. (This is really no different from Perl 5, except for the formal parameter.) 

my $compress = do {
    my $previous;
    sub ($x) { ... }
};

# or perhaps,

my $compress;
{
    my $previous;
    $compress = sub ($x) { ... }
}

[download]

In reply to Re: 99 Problems in Perl6 by gaal
in thread 99 Problems in Perl6 by Ovid

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