From: Love U Ruby <lists@...>
Date: 2013-04-06T22:45:02+09:00
Subject: Why `local_variables` printing the name of local variables,while it has been garbage collected?

Why `local_variables` printing the name of local variables,while it has
been garbage collected?

require 'weakref'

a = "abc"
p local_variables
p defined? a
p a.to_s
a =  WeakRef.new(a)
p GC.enable
GC.start
p local_variables
p defined? a
p a.to_s

Output:

[:a]
"local-variable"
"abc"
false
[:a]
"local-variable"
true.rb:253:in `<main>': Invalid Reference - probably recycled
(WeakRef::RefError)

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