def foo
    puts "foo"
end

foo

def self.bar
    puts "bar1"
end

self.bar

def self.bar
    puts "bar2"
end

self.bar

self.foo

module M
    def instance_m
        singleton_m # NoMethodError
    end
    def self.singleton_m
        instance_m # NoMethodError
    end

    instance_m # NoMethodError
    self.instance_m # NoMethodError

    singleton_m
    self.singleton_m
end

M.instance_m # NoMethodError
M.singleton_m

def call_instance_m
    instance_m # NoMethodError
end

class C
    include M
    instance_m # NoMethodError
    self.instance_m # NoMethodError

    singleton_m # NoMethodError
    self.singleton_m # NoMethodError

    def baz
        instance_m
        self.instance_m

        singleton_m # NoMethodError
        self.singleton_m # NoMethodError
    end
end

c = C.new
c.baz
c.singleton_m # NoMethodError
c.instance_m

class D < C
    def baz
        super
    end
end

d = D.new
d.baz
d.singleton_m # NoMethodError
d.instance_m

def optional_arg(a = 4, b: 5)
    a.bit_length
    b.bit_length
end

def call_block
    yield 1
end

def foo()
    var = Hash.new
    var[1]
    call_block { |x| var[x] }
end

class Integer
    def bit_length; end
    def abs; end
end

class String
    def capitalize; end
end

module Kernel
    alias :old_puts :puts
    def puts x; old_puts x end
end

class Module
    alias :old_include :include
    def module_eval; end
    def include x
        old_include x
    end
    def prepend; end
    def private; end
end

class Object < Module
    include Kernel
    def new; end
end

class Hash
    alias :old_lookup :[]
    def [] x; old_lookup(x) end
end

class Array
  alias :old_lookup :[]
  def [] x; old_lookup(x) end

  def length; end

  def foreach &body
    x = 0
    while x < self.length
        yield x, self[x]
        x += 1
    end
  end
end

def funny
    yield "prefix: "
end

funny { |i| puts i.capitalize}

"a".capitalize
1.bit_length
1.abs

["a","b","c"].foreach { |i, v| puts "#{i} -> #{v.capitalize}"} # TODO should resolve to String.capitalize

[1,2,3].foreach { |i| i.bit_length}

[1,2,3].foreach { |i| puts i.capitalize} # NoMethodError

[1,-2,3].foreach { |_, v| puts v.abs} # TODO should resolve to Integer.abs

def indirect &b
    call_block &b
end

indirect { |i| i.bit_length}


class S
    def s_method
        self.to_s
    end
end

class A < S
    def to_s
    end
end

class B < S
    def to_s
    end
end

S.new.s_method
A.new.s_method
B.new.s_method

def private_on_main
end

private_on_main

class Singletons
    def self.singleton_a
        puts "singleton_a"
        self.singleton_b
    end

    def self.singleton_b
        puts "singleton_b"
        self.singleton_c
    end

    def self.singleton_c
        puts "singleton_c"
    end

    def self.singleton_d
        puts "singleton_d"
        self.singleton_a
    end

    def instance
        def self.singleton_e
            puts "singleton_e"
        end
        singleton_e
    end

    class << self
        def singleton_f
            puts "singleton_f"
        end
    end

    def call_singleton_g
        self.singleton_g
    end
end

Singletons.singleton_a
Singletons.singleton_f

c1 = Singletons.new

c1.instance
c1.singleton_e

def c1.singleton_g;
    puts "singleton_g_1"
end

c1.singleton_g
c1.call_singleton_g

def c1.singleton_g;
    puts "singleton_g_2"
end

c1.singleton_g
c1.call_singleton_g

class << c1
    def singleton_g;
        puts "singleton_g_3"
    end
end

c1.singleton_g
c1.call_singleton_g

c2 = Singletons.new
c2.singleton_e # NoMethodError
c2.singleton_g # NoMethodError

self.new # NoMethodError

puts "top-level"

def Singletons.singleton_g
    puts "singleton_g"
end

Singletons.singleton_g
c1.singleton_g
c1.call_singleton_g
c2.singleton_g # NoMethodError
c3 = Singletons.new
c3.singleton_g # NoMethodError

def create(type)
    type.new.instance

    def type.singleton_h
        puts "singleton_h"
    end

    type.singleton_h
end

create Singletons
Singletons.singleton_h

x = Singletons

class << x
    def singleton_i
        puts "singleton_i"
    end
end

x.singleton_i
Singletons.singleton_i

class << Singletons
    def singleton_j
        puts "singleton_j"
    end
end

Singletons.singleton_j

class SelfNew
    def instance
        puts "SelfNew#instance"
        new.instance # NoMethodError
    end

    def self.singleton
        new.instance
    end

    new.instance
end

SelfNew.singleton

class C1
    def instance
        puts "C1#instance"
    end

    def return_self
        self
    end
end

class C2 < C1
    def instance
        puts "C2#instance"
    end
end

class C3 < C2
    def instance
        puts "C3#instance"
    end
end

def pattern_dispatch x
    case x
    when C3
        x.instance
    when C2
        x.instance
    when C1
        x.instance
    else
    end

    case x
        in C3 then x.instance
        in C2 => c2 then c2.instance
        in C1 => c1 then c1.instance
    end
end

c1 = C1.new
c1.instance

pattern_dispatch (C1.new)
pattern_dispatch (C2.new)
pattern_dispatch (C3.new)

C3.new.return_self.instance

def add_singleton x
    def x.instance
        puts "instance_on x"
    end
end

c3 = C1.new
add_singleton c3
c3.instance
c3.return_self.instance

class SingletonOverride1
    class << self
        def singleton1
            puts "SingletonOverride1#singleton1"
        end

        def call_singleton1
            singleton1
        end

        def factory
            self.new.instance1
        end
    end

    def self.singleton2
        puts "SingletonOverride1#singleton2"
    end

    def self.call_singleton2
        singleton2
    end

    singleton2

    def instance1
        puts "SingletonOverride1#instance1"
    end
end

SingletonOverride1.singleton1
SingletonOverride1.singleton2
SingletonOverride1.call_singleton1
SingletonOverride1.call_singleton2

class SingletonOverride2 < SingletonOverride1
    class << self
        def singleton1
            puts "SingletonOverride2#singleton1"
        end
    end

    def self.singleton2
        puts "SingletonOverride2#singleton2"
    end

    def instance1
        puts "SingletonOverride2#instance1"
    end
end

SingletonOverride2.singleton1
SingletonOverride2.singleton2
SingletonOverride2.call_singleton1
SingletonOverride2.call_singleton2

class ConditionalInstanceMethods
    if rand() > 0 then
        def m1
            puts "ConditionalInstanceMethods#m1"
        end
    end

    def m2
        puts "ConditionalInstanceMethods#m2"

        def m3
            puts "ConditionalInstanceMethods#m3"

            def m4
                puts "ConditionalInstanceMethods#m4"
            end
        end

        m3
    end

    if rand() > 0 then
        Class.new do
            def m5
                puts "AnonymousClass#m5"
            end
        end.new.m5
    end
end

ConditionalInstanceMethods.new.m1
ConditionalInstanceMethods.new.m3 # NoMethodError
ConditionalInstanceMethods.new.m2
ConditionalInstanceMethods.new.m3 # currently unable to resolve
ConditionalInstanceMethods.new.m4 # currently unable to resolve
ConditionalInstanceMethods.new.m5 # NoMethodError

EsotericInstanceMethods = Class.new do
    [0,1,2].each do
        def foo
            puts "foo"
        end
    end

    Class.new do
        def bar
            puts "bar"
        end
    end.new.bar

    [0,1,2].each do |i|
        define_method("baz_#{i}") do
            puts "baz_#{i}"
        end
    end
end

EsotericInstanceMethods.new.foo # currently unable to resolve
EsotericInstanceMethods.new.bar # NoMethodError
EsotericInstanceMethods.new.baz_0 # currently unable to resolve
EsotericInstanceMethods.new.baz_1 # currently unable to resolve
EsotericInstanceMethods.new.baz_2 # currently unable to resolve

module ExtendSingletonMethod
    def singleton
        puts "ExtendSingletonMethod#singleton"
    end

    extend self
end

ExtendSingletonMethod.singleton

module ExtendSingletonMethod2
    extend ExtendSingletonMethod
end

ExtendSingletonMethod2.singleton

module ExtendSingletonMethod3
end

ExtendSingletonMethod3.extend ExtendSingletonMethod

ExtendSingletonMethod3.singleton

foo = "hello"
foo.singleton # NoMethodError
foo.extend ExtendSingletonMethod

foo.singleton

module ProtectedMethodInModule
    protected def foo
        puts "ProtectedMethodInModule#foo"
    end
end

class ProtectedMethods
    include ProtectedMethodInModule

    protected def bar
        puts "ProtectedMethods#bar"
    end

    def baz
        foo
        bar
        ProtectedMethods.new.foo
        ProtectedMethods.new.bar
    end
end

ProtectedMethods.new.foo # NoMethodError
ProtectedMethods.new.bar # NoMethodError
ProtectedMethods.new.baz

class ProtectedMethodsSub < ProtectedMethods
    def baz
        foo
        ProtectedMethodsSub.new.foo
    end
end

ProtectedMethodsSub.new.foo # NoMethodError
ProtectedMethodsSub.new.bar # NoMethodError
ProtectedMethodsSub.new.baz

[C.new].each { |c| c.baz }
["a","b","c"].each { |s| s.capitalize }

class SingletonUpCall_Base
    def self.singleton
    end
end
class SingletonUpCall_Sub < SingletonUpCall_Base
    singleton
    singleton2 # should not resolve
    def self.mid_method
        singleton
        singleton2 # should resolve
    end
end
class SingletonUpCall_SubSub < SingletonUpCall_Sub
    def self.singleton2
    end

    mid_method
end

class SingletonA
    def self.singleton1
    end

    def self.call_singleton1
        singleton1
    end

    def self.call_call_singleton1
        call_singleton1
    end
end

class SingletonB < SingletonA
    def self.singleton1
    end

    def self.call_singleton1
        singleton1 # should not be able to target `SingletonA:::singleton1` and `SingletonC:::singleton1`
    end
end

class SingletonC < SingletonA
    def self.singleton1
    end

    def self.call_singleton1
        singleton1 # should not be able to target `SingletonA:::singleton1` and `SingletonB:::singleton1`
    end
end

SingletonA.call_call_singleton1
SingletonB.call_call_singleton1
SingletonC.call_call_singleton1

module Included
    def foo
        self.bar
    end
    def bar
    end
end

class IncludesIncluded
    include Included
    def bar
        super
    end
end

class CustomNew1
    def self.new
        C1.new
    end     
end

CustomNew1.new.instance

class CustomNew2
    def self.new
        self.allocate
    end

    def instance
        puts "CustomNew2#instance"
    end
end

CustomNew2.new.instance

def capture_parameter x
    [0,1,2].each do
        x
    end
end

(capture_parameter C1.new).instance # NoMethodError