[ruby-core:57259] [ruby-trunk - Bug #8920] Exception when using a variable defined in end-of-line if statement

Issue #8920 has been updated by nobu (Nobuyoshi Nakada).

Description updated


----------------------------------------
Bug #8920: Exception when using a variable defined in end-of-line if statement
https://bugs.ruby-lang.org/issues/8920#change-41876

Author: jfredett (Joe Fredette)
Status: Rejected
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.0.0p247 
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


=begin
The following code raises an exception on each MRI version (exact ((%`ruby -v`%)) output attached at the end of this post):

 class Test
   def foo
     puts "No Exception!"
   end
 end

 begin
   t.foo if t = Test.new
 rescue Exception => e
   STDERR.puts "Exception raised! ``#{e.class}: #{e}''"
   exit 1
 end

 exit 0

The exception raised is:

 NameError: undefined local variable or method `t' for main:Object


The output I expected was "No Exception."

This script was run on the following system:

 $ rvm --version
 #=> rvm 1.21.17 (stable) by Wayne E. Seguin <[e-mail]>, Michal Papis <[e-mail]> [https://rvm.io/]

 $ uname -a
 #=> Darwin JGF.local 12.4.0 Darwin Kernel Version 12.4.0: Wed May  1 17:57:12 PDT 2013; root:xnu-2050.24.15~1/RELEASE_X86_64 x86_64 i386 MacBookPro8,2 Darwin

(For reference, this is a mid-2011 Macbook Pro)

and raises the unexpected exception on the following ruby versions:

 ruby 1.8.7 (2012-02-08 patchlevel 358) [universal-darwin12.0]
 ruby 1.9.3p448 (2013-06-27 revision 41675) [x86_64-darwin12.3.0]
 ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-darwin12.3.0]

It also appears to raise in JRuby, but not in Rubinius, though that may or may not be relevant for this bugtracker.

Please let me know if I need to provide any other details. I put 2.0.0 in the ((%`ruby -v`%)) field, but it is reproducible on each of the MRI versions I listed above.

=end



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