From: "mame (Yusuke Endoh)" <mame@...>
Date: 2012-11-25T18:17:03+09:00
Subject: [ruby-core:50072] [ruby-trunk - Feature #7432][Assigned] Explicit way to define local variable in scope


Issue #7432 has been updated by mame (Yusuke Endoh).

Status changed from Open to Assigned
Assignee set to matz (Yukihiro Matsumoto)
Priority changed from Normal to Low
Target version set to Next Major

Assigning to matz, but don't hold your breath; matz has rejected such a explicit variable declaration syntax many times.

-- 
Yusuke Endoh <mame@tsg.ne.jp>
----------------------------------------
Feature #7432: Explicit way to define local variable in scope
https://bugs.ruby-lang.org/issues/7432#change-33851

Author: prijutme4ty (Ilya Vorontsov)
Status: Assigned
Priority: Low
Assignee: matz (Yukihiro Matsumoto)
Category: 
Target version: Next Major


Imagine code such as this
  def test_smth
    result = nil
    assert_nothing_raised { result = some_slow_calculation }
    assert_equal expected_answer, result
  end
Line `result = nil` means nothing more than our intention to simply bind variable `result` in scope of assertion block with outer local variable. In large methods it can be much heavier to find out this obscured intention.
It may be better to introduce a method (if it can be implemented) or a keyword which simply creates a local variable (probably with nil value just to mark its existence)

define_variable 'x' or (define_variable x if it's a keyword)


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