From: Jim Weirich <jim@...>
Date: 2004-08-13T02:28:36+09:00
Subject: Re: Reasons for precedence? (Was: Curly syntax for muliline      blocks...)


Mark Hubbart said:
[... examples elided ...]

> I realize this particular example is rather contrived, but obviously
> these things pop up from time to time in one's code. Is there any
> particular reason that do...end blocks were given different precedence
> from {...} blocks?

Given
  def g() 1 end
  def f(n) yield(n) end

  f g do |x| puts "Got #{x}" end   # => Got 1
  f g  { |x| puts "Got #{x}" }     # fails

Prints ...

  Got 1
  x.rb:2:in `f': no block given (LocalJumpError)
          from x.rb:5

In Rake, do/end work better with idiomatic rake usage than the curly
version.  (See http://rake.rubyforge.org/files/doc/rakefile_rdoc.html at
the bottom of the page).

-- 
-- Jim Weirich     jim@weirichhouse.org    http://onestepback.org
-----------------------------------------------------------------
"Beware of bugs in the above code; I have only proved it correct,
not tried it." -- Donald Knuth (in a memo to Peter van Emde Boas)