On Wed, Jul 9, 2008 at 10:35 PM, Allen Wirfs-Brock <
[EMAIL PROTECTED]> wrote:
> Every valid proposed ES3.1 cautious subset program is also a valid program
> in the full language.
I don't think it works to restate the "fail stop subset" notion in terms of
validity. Rather, we can say that an ES3.1 cautious program that runs
without causing any cautiousness-induced failures will run the same way in
the full language. Put another way, Given an alleged ES3.1 cautious program,
it will
* be statically rejected
* cause a failure by violating a dynamic cautiousness restriction
* execute as it would in the full ES3.1 language.
For example, the following is a perfectly *valid* ES3.1 cautious function:
function isCautious() {
function foo() {this;}
try { foo(); } catch (e) { return true; }
return false;
}
--
Cheers,
--MarkM
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