try..catch..pass..finally Was: DMD 0.148 - scope guard

[Stewart Gordon]

Regan Heath wrote:
<snip>
> To achieve the same thing that on_scope gives with try/finally requires 
> you to store state somewhere to indicate which parts of the finally 
> block to execute, or, it requires that you define several finally blocks 
> and nest them. Both of those options are no where near as neat as on_scope.
> 
> I'm honestly baffled that people can't see the difference.

When I started to read it, it did indeed look like syntactic sugar for 
try/finally.  But then I realised that, as you say, it saves some of the 
need to nest try/finally blocks.

on_scope_failure has another advantage still: if you have multiple catch 
blocks, it saves having to replicate the recovery code in each.

Stewart.

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