On Mon, Jan 4, 2010 at 5:15 AM, Ovid
<publiustemp-perl6langua...@yahoo.com> wrote:
> Given this code:
>    subset Filename of Str where { $_ ~~ :f };
>    sub foo (Filename $name) {
>        say "Houston, we have a filename: $name";
>    }
> Obviously the error message can use some work, but how would I customize that 
> error message (assuming such will be possible in the future)?  Clearly there 
> will be many cases where a custom error message for constraint failure could 
> make life much easier for developers.

How about
multi sub foo(Any $name) { die "Houston, we have a major malfunction."}


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