comment on

> I'm fine with using tie as long as I can untie when I'm done. Otherwise the penalty for this syntactic sugar would be to huge.

At second thought this is a too limited technique... consider

 
while(1) {
  my $x :check = some_call();
}
[download]

The check would be done only once, so in this case I'd clearly prefer a functional approach

 
while(1) {
  check {RULE} my $x = some_call();
}
[download]

Using attributes is a pretty way to apply ties, but most use cases I can think of combining this with untie are limited to debugging.

> > > And for completeness , I'm sure you could also use variable :attributes for such checks.

Wrong I was, young padawan. ;-)

Cheers Rolf
_{(addicted to the Perl Programming Language and ☆☆☆☆ :)

Je suis Charlie!}

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