Looking when default arguments are resolved in Ruby 2.0

default_values.rb

def foo(x: wtf)
end

puts "wtf did not get called when the method was defined"

foo x: 1

puts "wtf did not get called when we passed a value for x"

begin
  foo
rescue => ex
  puts "tried to call wtf, so we got #{ex.class} #{ex.message}"
end