From: Erwin Abbott <erwin.abbott@...>
Date: 2007-06-10T15:53:45+09:00
Subject: Passing block to Proc#call

I'd like to do something like:

x = lambda do |*args|
  if args.size == 5
    # call another block
    yield *args.map{|x| x.gsub(/es$/, '') }
  end
end

x.call(*%w[cats dogs ones twos threes]) do |*words|
  puts words.last # output: thre
end

But x.call(..) { block } raises LocalJumpError: no block given. I'm
not sure how to pass a block because it seems #call doesn't pass it
on. Sorry if this is a common question, but I'm having a hard time
searching for help because "passing block to lamda call" appears in
every page about the basics of closures.

I see lamda {|&block| ... } is added in ruby 1.9, but I'd like to be
compatible with 1.8 too.