From: naruse@...
Date: 2014-07-25T18:29:03+00:00
Subject: [ruby-core:64013] [ruby-trunk - Bug #10042] Deprecate postfix rescue syntax for removal in 3.0

Issue #10042 has been updated by Yui NARUSE.


I sometimes use postfix rescue, and often want a new syntax to specify exceptions to rescue.

----------------------------------------
Bug #10042: Deprecate postfix rescue syntax for removal in 3.0
https://bugs.ruby-lang.org/issues/10042#change-48028

* Author: Charles Nutter
* Status: Open
* Priority: Normal
* Assignee: 
* Category: core
* Target version: next minor
* ruby -v: 2.1 something
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
----------------------------------------
The postfix rescue notation is convenient...but almost always is a really bad antipattern.

An example of the notation:

    Integer(f) rescue f # returns f if it is not parseable as an Integer

It silently ignores all StandardError raised by a piece of code...which often covers *many* more exceptions than the user *wants* to be ignoring.

It also hides the cost of constructing and throwing away all those ignored exceptions.

I believe Matz has even said in the past that he regrets adding the feature.

In any case, I propose that "rescue nil" should be deprecated with a warning (either always on or only when verbose) and we should plan to remove it in 3.0.

Who's with me?!



-- 
https://bugs.ruby-lang.org/