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$VERBOSE = true

class Super
  def a
    "super_a"
  end

  def b
    "super_b" + c
  end

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behavior :array_uniq_on_dupulicated_elements, :shared => true do
  it "returns a squashed array" do
    verify([1, 1].send(@method)).is.eq([1])
  end
end

describe "Array#uniq" do
  context "when elements are duplicated" do
    verify.behavior(:array_uniq_on_dupulicated_elements, :uniq)

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describe "Foo" do
  context "Bar" do
    it "Baz" do
    end
  end
end

#=> "Foo Bar Baz"

describe "Foo" do

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$VERBOSE = true

class Super
  class << self
    CONS = :Singleton
  end

  CONS = :Super
end

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My 正誤表 - パーフェクトRuby(初版・第一刷)

そのうち、 サポートページ_ とかに正式なの出来るのかもしれませんけど、2013/8/31時点では見当たら無かったので。

136 is_a? -> instance_of?

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class Integer
  def pred
    self - 1
  end
end

1.pred #=> 0
0.pred #=> -1

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class Array
  def init
    self[0..-2]
  end
end

[1, 3, 7].init #=> [1, 3]

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rubinius 2.0.0.n224 (1.9.3 e91782d0 2013-08-12 JI) [x86_64-unknown-linux-gnu]

Class.allocate.allocate #=> pass
Class.allocate.new #=> crash
Class.allocate.allocate.send(:initialize) #=> crash

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# find_longest_api_name
# 2013 Kenichi Kamiya
# ruby -v: ruby 2.1.0dev (2013-08-10 trunk 42476) [x86_64-linux]

$VERBOSE = true

class BasicObject
  def longest_method_name
    (methods(true) | private_methods(true)).reject { |name|
      /\Alongest_(?:instance_)?method_name\z/ =~ name }.max_by(&:length)

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RUBY_DESCRIPTION #=> "ruby 2.1.0dev (2013-08-09 trunk 42473) [x86_64-linux]

$VERBOSE = true

obj = Object.new
mod = Module.new.taint

obj.taint.singleton_class.tainted? #=> true

obj2 = Object.new