Ruby: Proc#call vs yield

Question

What are the behavioural differences between the following two implementations in Ruby of the thrice method?

module WithYield
  def self.thrice
         


        

Answer 1

BTW, just to update this to current day using:

ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-linux]

On Intel i7 (1.5 years oldish).

user     system      total        real
0.010000   0.000000   0.010000 (  0.015555)
0.030000   0.000000   0.030000 (  0.024416)
0.120000   0.000000   0.120000 (  0.121450)
0.240000   0.000000   0.240000 (  0.239760)

Still 2x slower. Interesting.