Issue #9285 has been updated by naruse (Yui NARUSE).


At first, I say what it is.
It is the C function name where the exception is raised.
Therefore you can't the name from Ruby.

The background is that IO-related exceptions may be raised many places.
If I encounter an unexpected exception, only errno is not sufficient information.
I cannot debug without where the error is generated.
The string gives us the information.

Anyway normal ruby users don't need such information.
Therefore it may be hidden on release build.
----------------------------------------
Bug #9285: Exception message of Errno::ENOENT contains strings @ rb_sysopen and @ dir_initialize in Ruby 2.1
https://bugs.ruby-lang.org/issues/9285#change-43846

Author: abotalov (Andrey Botalov)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.1.0dev (2013-12-20 trunk 44301) [x86_64-linux]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN, 2.1: UNKNOWN


Exception message of Errno::ENOENT exception contains strings "@ rb_sysopen" or "@ dir_initialize" in Ruby 2.1.0-rc1. It doesn't contain them in Ruby 2.0. I would expect exception message not to contain those strings.

Example in Ruby 2.1:
$ irb    
2.1.0dev :001 > File.new('/path/to/not/existent/file')
Errno::ENOENT: No such file or directory @ rb_sysopen - /path/to/not/existent/file
	from (irb):1:in `initialize'
	from (irb):1:in `new'
	from (irb):1
	from /home/andrey/.rvm/rubies/ruby-2.1.0-rc1/bin/irb:11:in `<main>'
2.1.0dev :002 > Dir.open('/path/to/not/existent/folder')
Errno::ENOENT: No such file or directory @ dir_initialize - /path/to/not/existent/folder
	from (irb):2:in `open'
	from (irb):2
	from /home/andrey/.rvm/rubies/ruby-2.1.0-rc1/bin/irb:11:in `<main>'
2.1.0dev :003 > 


Version: ruby 2.1.0dev (2013-12-20 trunk 44301) [x86_64-linux]
It's installed via RVM.
Ubuntu 13.04


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