From: Mike Gold <mike.gold.4433@...>
Date: 2008-12-11T08:18:35+09:00
Subject: lambda with $1 fails as gsub block


I came across this problem:

  def meth(replace)
    ">x".gsub(%r!(\W)x!, &replace)
  end

  replace = lambda { |match|
    puts "$1 is #{$1.inspect}"
  }

  ">x".gsub(%r!(\W)x!, &replace)  # => $1 is ">"

  "" =~ %r!!  # reset $1

  meth(replace)  # => $1 is nil

Apparently $1 is bound in a peculiar way:

  http://groups.google.com/group/comp.lang.ruby/browse_thread/thread/e24a19e6ea75e5de/0211d0b304cbbad0?hl=en%C3%93d0b304cbbad0

Matz suggested that the MatchData could have been passed to the block
for convenience, however it looks more like a necessity, as I don't see
a solution short of rewriting gsub.

This suggests that for 1.9, MatchData should be passed as an optional
second argument to the block.  Yes?
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