>>> throw 0
>>> endfunction
>>
>>> if 1
>>> call Foo()
>>> endif
>>
>>> When I execute the above script I get
>>> E605: Exception not caught: 0
>>> [...]
>>> line 6:
>>> E171: Missing :endif
>>
> But I don't want to catch the exception. This arose in a
> situation where I want a command to stop executing if a
> certain condition happens and the only way I found to achieve
> this is to throw an exception which doesn't get caught. This
> worked as planned but I also got the "Missing :endif" message
> which made me wonder whether I had forgotten to put an endif
> somewhere. My code was simple enough that I was able to
> ascertain without much effort that no endif was actually
> missing but it made me wonder whether the "Missing :endif"
> message is a feature or a bug.
>
> In every programming language I know you can throw exceptions
> which don't get caught and you don't get a message that an if
> terminator (or any other syntactic terminator) is missing.
Yeah. I doubt it's deliberate, but expect it's a side-effect of the fact
that :if and :endif aren't actually syntactic in Vim. They are just
commands, and Vim keeps track of them as they are executed. If an
exception is thrown, you are jumped to a location where execution does
not pass the :endif and so Vim does not see it and thinks it's missing.
I think most people would realise that when they see an exception
thrown, it's likely that error messages such as missing :endif occurring
after it are bogus. Experienced Vimmers would realise this is because of
the altered execution path and the fact that :endif is merely a command.
Ben.
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