From: Adam Prescott <adam@...>
Date: 2012-01-16T06:29:06+09:00
Subject: Re: rescue Exception => ex

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On Sun, Jan 15, 2012 at 20:42, Ralph Shnelvar <ralphs@dos32.com> wrote:

>  rescue MySpecialError => ex
>
> Does the
>  =>
> have anything to do with hashes or is this syntax reserved for rescue
> clauses?
>

It's a fair question, since the "=>" is shared between the two. However, if
this syntax were actually a hash, it would be getting passed to rescue() as
a method, but ex would be seen as a local variable. Explicitly:

begin
  raise StandardError
rescue({StandardError => e})
  p e
end

# NameError: undefined local variable or method `e' for main:Object

or

begin
  raise StandardError
rescue(StandardError => e)
  p e
end

# SyntaxError: (irb):8: syntax error, unexpected tASSOC, expecting ')'
# rescue(StandardError => e)

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