From: Glen Holcomb <damnbigman@...>
Date: 2008-10-02T00:22:15+09:00
Subject: Re: "ensure" hiding actual error

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On Wed, Oct 1, 2008 at 9:08 AM, Nit Khair <sentinel.2001@gmx.com> wrote:

> Robert Klemme wrote:
> > 2008/10/1 Thomas B. <tpreal@gmail.com>:
> >> Nit Khair wrote:
> >>> Now in real life, "@test = " calls a method elsewhere which may call
> >>> other methods. So i am clueless as to where the error actually is.
> >>
> >> You caused another exception inside your ensure clause, so the previous
> >> one got lost, so that's your mistake. If you want the original exception
> >> to live to tell the tale, you cannot raise another in your ensure
> >> clause. But if your ensure clause was correct, there wouldn't be any
> >> problems with handling correctly the original exception.
> >
>
> I am not following you. How have i caused another exception in the
> ensure clause. I am not raising an exception in the ensure. The ensure
> clause only has some statement to free resources. as in :
>
>
> begin
> my_form = create_....
>
> ensure
> my_form.free_form.
> ...
> end
>

What happens here if my_form never got a value because there was an error
previous that made create_... invalid?

What Thomas is saying is that there is an exception being raised by the code
present in your ensure block.


>
>
> In the example i gave you, the stderr.print is printing the error from
> above, but in my original ncurses program, it seems to directly go to
> the ensure.
>
> Let's say in my ensure I said:
>
>  my_form.free_form if !my_form.nil?
> then the program would just terminate silently.
>
>
> > Adding to that: an uninitialized variable does not cause a syntax
> > error.  IIRC initially this was about a syntax error.
> >
>
> Okay, i was trying to give you a simple example. Sometimes it is a
> variable - i may misspell it, or in some cases it is a syntax error.
>
> Even currently as I am refactoring my code, I am sometimes getting the
> correct error, sometimes I have to comment out "ensure" to get the
> error.
>
> > Cheers
> >
> > robert
>
> Perhaps I should ask the question differently. Am i doing something
> wrong, am i using the ensure clause incorrectly (the samples I started
> with released these structures in the ensure). This is my first major
> ruby app.
> Thanks a lot for your time, Robert!
> --
> Posted via http://www.ruby-forum.com/.
>
>


-- 
"Hey brother Christian with your high and mighty errand, Your actions speak
so loud, I can't hear a word you're saying."

-Greg Graffin (Bad Religion)

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