dest.rb

class Foo
	def to_a
		[:to_a, :to_a]
	end

	def to_ary
		[:to_ary, :to_ary]
	end
end

a, b, c = *Foo.new
p [a, b, c]

a, b, c = Foo.new
p [a, b, c]

# ruby 2.0.0p481 (2014-05-08 revision 45883) [universal.x86_64-darwin13]
# [:to_a, :to_a, nil]
# [:to_ary, :to_ary, nil]

# mruby --version
# mruby 1.2.0 (2015-11-17) 
# [:to_a, :to_a, nil]
# [#<Foo:0x7fd711804a40>, nil, nil]