[osflash] Enforce the use of try block... catch

[erixtekila]

> The difference is that in haXe instead of using the exception 
> mechanism,
> we can return an "enum" that forces the use to "switch" and handle all
> the different cases, including the exception.
>
> Everything is entirely strictly-typed thanks to type-inference.
Very clever… as usual !

> Hope that helps,
Of course it does.
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erixtekila
http://blog.v-i-a.net/