From: Brian Candler <b.candler@...>
Date: 2009-03-06T20:20:59+09:00
Subject: Re: What's wrong with lambda and class

Actually, the question for me was "why 1?" in your second case. Passing 
a lambda as a block argument to a method is an odd thing to do; I 
believe it is being coerced to a block as if you did Proc.new(&c).

Maybe this makes it clearer:

def call_block(&c)
  c.call
end

def lambda_and_call
  c = lambda { return 1 }
  call_block(&c) + 1         # the lambda returns 1
end

p lambda_and_call

def yield_block(&c)
  yield
end

def lambda_and_yield
  c = lambda { return 1 }
  x = yield_block(&c)        # the entire method returns 1
  STDERR.puts "This line is not reached!"
  x + 1
end

p lambda_and_yield
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