From: Andrew Wagner <wagner.andrew@...>
Date: 2010-10-24T02:43:59+09:00
Subject: Re-naming a block

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Hi all.

I'm writing a method which takes a block and returns a lambda which will
execute that block when called. Here's the code:

def foo &block
  Proc.new { yield }
end

a = foo { 3 }
puts a


This returns something like #<Proc:0x2a50b08@scratch2.rb:2 (lambda)>. That's
all well and good, but what I'd really like is for that line number to show
up as 5, since that's where the block is actually defined. So I try this:

def foo &block
  a = Proc.new { yield }
  def a.to_s
    block.to_s
  end
  a
end

a = foo { 3 }
puts a

But here, ruby tells me that 'block' is undefined inside a's to_s. It's
clearly not creating the closure I'd hoped for. I've played around with a
few variations, but can't seem to get it to do what I want. Suggestions?

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