From: "Юрий Соколов" <funny.falcon@...>
Date: 2014-07-27T20:03:01+04:00
Subject: [ruby-core:64076] Re: [ruby-trunk - Feature #6739][Open] One-line rescue statement should support specifying an exception class

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do_something rescue SomeError with puts "SomeError occured"
16.07.2012 1:50 =D0=BF=D0=BE=D0=BB=D1=8C=D0=B7=D0=BE=D0=B2=D0=B0=D1=82=D0=
=B5=D0=BB=D1=8C "Quintus (Marvin G=C3=BClker)" <sutniuq@gmx.net>
=D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB:

>
> Issue #6739 has been reported by Quintus (Marvin G=C3=BClker).
>
> ----------------------------------------
> Feature #6739: One-line rescue statement should support specifying an
> exception class
> https://bugs.ruby-lang.org/issues/6739
>
> Author: Quintus (Marvin G=C3=BClker)
> Status: Open
> Priority: Normal
> Assignee:
> Category: core
> Target version: 2.0.0
>
>
> Hi there,
>
> When wrapping up a single line inside a begin/rescue block I feel
> constantly annoyed that I have to create a whole lot of bloated code just
> to rescue from a specific exception. For example:
>
>   begin
>     File.read("myfile.txt")
>   rescue Errno::ENOENT
>     puts "No file there"
>   end
>
> Now it's possible to do this:
>
>   File.read("myfile.txt") rescue puts "No file there"
>
> But this forces me to rescue from StandardError which is not really what =
I
> want, because it swallows exceptions I'd rather have wanted to see, e.g. =
if
> I mistyped `File.read' as `File.raed' this would be swallowed as well. I
> know it is possible to compress the multiline statements above into a
> single line by using semicolons, but it's better to avoid them as they
> decrease readability.
>
> So my suggestion is to add something like the following syntax to Ruby:
>
>   File.read("myfile.txt") rescue Errno::ENOENT, puts "No file there"
>
> This way it is more consise than having to write five lines (instead of
> just one) and still reads good (as opposed to the semicolon trick). Maybe
> the syntax isn't ideal as the comma operator is already used elsewhere, b=
ut
> the general idea should be clear though.
>
> Valete,
> Marvin
>
>
> --
> http://bugs.ruby-lang.org/
>
>

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<p dir=3D"ltr">do_something rescue SomeError with puts &quot;SomeError occu=
red&quot;</p>
<div class=3D"gmail_quote">16.07.2012 1:50 =D0=BF=D0=BE=D0=BB=D1=8C=D0=B7=
=D0=BE=D0=B2=D0=B0=D1=82=D0=B5=D0=BB=D1=8C &quot;Quintus (Marvin G=C3=BClke=
r)&quot; &lt;<a href=3D"mailto:sutniuq@gmx.net">sutniuq@gmx.net</a>&gt; =D0=
=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB:<br type=3D"attribution"><blockquot=
e class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc sol=
id;padding-left:1ex">
<br>
Issue #6739 has been reported by Quintus (Marvin G=C3=BClker).<br>
<br>
----------------------------------------<br>
Feature #6739: One-line rescue statement should support specifying an excep=
tion class<br>
<a href=3D"https://bugs.ruby-lang.org/issues/6739" target=3D"_blank">https:=
//bugs.ruby-lang.org/issues/6739</a><br>
<br>
Author: Quintus (Marvin G=C3=BClker)<br>
Status: Open<br>
Priority: Normal<br>
Assignee:<br>
Category: core<br>
Target version: 2.0.0<br>
<br>
<br>
Hi there,<br>
<br>
When wrapping up a single line inside a begin/rescue block I feel constantl=
y annoyed that I have to create a whole lot of bloated code just to rescue =
from a specific exception. For example:<br>
<br>
=C2=A0 begin<br>
=C2=A0 =C2=A0 File.read(&quot;myfile.txt&quot;)<br>
=C2=A0 rescue Errno::ENOENT<br>
=C2=A0 =C2=A0 puts &quot;No file there&quot;<br>
=C2=A0 end<br>
<br>
Now it&#39;s possible to do this:<br>
<br>
=C2=A0 File.read(&quot;myfile.txt&quot;) rescue puts &quot;No file there&qu=
ot;<br>
<br>
But this forces me to rescue from StandardError which is not really what I =
want, because it swallows exceptions I&#39;d rather have wanted to see, e.g=
. if I mistyped `File.read&#39; as `File.raed&#39; this would be swallowed =
as well. I know it is possible to compress the multiline statements above i=
nto a single line by using semicolons, but it&#39;s better to avoid them as=
 they decrease readability.<br>

<br>
So my suggestion is to add something like the following syntax to Ruby:<br>
<br>
=C2=A0 File.read(&quot;myfile.txt&quot;) rescue Errno::ENOENT, puts &quot;N=
o file there&quot;<br>
<br>
This way it is more consise than having to write five lines (instead of jus=
t one) and still reads good (as opposed to the semicolon trick). Maybe the =
syntax isn&#39;t ideal as the comma operator is already used elsewhere, but=
 the general idea should be clear though.<br>

<br>
Valete,<br>
Marvin<br>
<br>
<br>
--<br>
<a href=3D"http://bugs.ruby-lang.org/" target=3D"_blank">http://bugs.ruby-l=
ang.org/</a><br>
<br>
</blockquote></div>

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