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use v5.14;

#my $fact = sub { (sub { goto &{$_[0]} })->(sub { $_[1] ? $_[1] * $_[0
+]($_[0], $_[1]-1) : 1 }, $_[0]) };
...

*fact = (sub { my ($auto_fun,) = @_; sub { $auto_fun->($auto_fun, @_) 
+} })->( sub { my ($self, $value) = @_; $value ? $value * $self->($sel
+f, $value - 1) : 1 } );
say "Test fact: $_!=", fact($_) for 3, 4, 5;