Edward Z. Yang wrote:
Is there a way to catch an 'error<xml>asdf</xml>'? For example the json module uses error to indicate parse failure, and instead I'd like to catch it and try something else.
There's currently no way to catch errors with nestable constructs (e.g., exception handling as in ML), but there is [onError], as you mentioned. The nice approach to your concrete problem would be to build alternate parsing machinery that returns a type indicating errors. ;)
The onError function seems like a partial mechanism for this, but I don't understand how scoping on onError works; if I register something as onError, is it permanently called on error? Is it displaced by the next onError I call?
Within a single client-side page execution, registered event handlers stay registered forever. When multiple handlers are registered, they will all run in reverse registration order. (I've added a bit about this to the manual.)
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