From: Brian Candler <b.candler@...>
Date: 2008-11-13T02:12:32+09:00
Subject: Re: unexpected return (LocalJumpError)

Robert Dober wrote:
> IIRC this will change in 1.9

In what way?

proc is now an alias for Proc.new instead of lambda. But what other 
changes are in the pipeline?

BTW I agree that this is a feature, not a bug. But it's not obvious to 
the newcomer that there are two, rather different, closure-like objects:

- lambda is standalone. A 'return' returns from the lambda.

- Proc.new / block is created within the context of a method. A 'return'
  returns from that method. If the method has already terminated, then
  'return' makes no sense and causes an error.

The first is what Lisp programmers expect. The second is what makes it 
possible to write

   def calculate_something(foo)
     foo.each do |params|
       ...
       return val if cond
     end
   end
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