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Feature #8600

closed

Recognize variables declared in if modifier at end of line

Added by rudolph9 (Kurt Rudolph) over 11 years ago. Updated over 11 years ago.

Status:
Rejected
Assignee:
-
Target version:
[ruby-core:55783]

Description

=begin
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 pry'

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
=end


Related issues 3 (0 open3 closed)

Is duplicate of Ruby master - Feature #1141: assignment of variable in "right" if statement failsRejected02/11/2009Actions
Is duplicate of Ruby master - Feature #4965: The problem of "print line if line = DATA.gets"Rejectedmatz (Yukihiro Matsumoto)07/03/2011Actions
Is duplicate of Ruby master - Bug #6132: Assignments don't happen correctly in "if" modifiersRejected03/12/2012Actions

Updated by rosenfeld (Rodrigo Rosenfeld Rosas) over 11 years ago

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

Updated by rosenfeld (Rodrigo Rosenfeld Rosas) over 11 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...

Updated by matz (Yukihiro Matsumoto) over 11 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.

Matz.

Updated by nobu (Nobuyoshi Nakada) over 11 years ago

  • Description updated (diff)
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