Rubyのラムダ式まわり。func_with_blockあたりがクサい

gistfile1.rb

def func_without_args
  yield if block_given?
end

def func_with_block &block
  yield block
end

def func_with_proc p
  p.call
end

begin
  func_without_args -> { puts "Hello" }
rescue => e
  puts e        #=> wrong number of arguments (1 for 0)
end

begin
  func_without_args &-> { puts "Hello" }        #=> Hello
rescue => e
  puts e
end

begin
  func_with_block -> { puts "Hello" }
rescue => e
  puts e        #=> wrong number of arguments (1 for 0)
end

begin
  func_with_block &-> { puts "Hello" }
rescue => e
  puts e        #=> wrong number of arguments (1 for 0)
end

begin
  func_with_proc -> { puts "Hello" }            #=> Hello
rescue => e
  puts e
end

begin
  func_with_proc &-> { puts "Hello" }
rescue => e
  puts e        #=> wrong number of arguments (0 for 1)
end