Feature #8600

Recognize variables declared in if modifier at end of line

Added by Kurt Rudolph over 2 years ago. Updated over 2 years ago.



2.0.0 (main):0 > .ruby -v
ruby 2.0.0p195 (2013-05-14 revision 40734) [x86_64-darwin12.3.0]
2.0.0 (main):0 > ([0,1,2])[i] = 1.0 if i = ['seconds'].find_index('seconds')
NameError: undefined local variable or method i' for main:Object
from (pry):1:in

Is it possible to get rid of this kind of error? Especially since it doesn't matter what the value of the variable is so long as it's defined.

2.0.0 (main):0 > i = 10000
=> 10000
2.0.0 (main):0 > ([0,1,2])[i] = 1.0 if i = ['seconds'].find_index('seconds')
=> 1.0

Related issues

Duplicates Ruby trunk - Feature #1141: assignment of variable in "right" if statement fails Rejected 02/11/2009
Duplicates Ruby trunk - Feature #4965: The problem of "print line if line = DATA.gets" Rejected 07/03/2011
Duplicates Ruby trunk - Bug #6132: Assignments don't happen correctly in "if" modifiers Rejected 03/12/2012


#1 Updated by Rodrigo Rosenfeld Rosas over 2 years ago

A long-time +1, but if I remember correctly Matz doesn't want this because it could introduce backward incompatibility...

#2 Updated by Rodrigo Rosenfeld Rosas over 2 years ago

Or maybe because it would be too complex to change the parser to support that? Now I'm not sure about the reasons...

#3 Updated by Yukihiro Matsumoto over 2 years ago

  • Description updated (diff)
  • Status changed from Open to Rejected

Variables are declared in the order of appearance. I don't want to introduce exceptions.


#4 Updated by Nobuyoshi Nakada over 2 years ago

  • Description updated (diff)

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