Separate meta-programming features to `mruby-metaprog` gem.

We assume meta-programming is less used in embedded environments.
We have moved following methods:

 * Kernel module
   global_variables, local_variables, singleton_class,
   instance_variables, instance_variables_defined?, instance_variable_get,
   instance_variable_set, methods, private_methods, public_methods,
   protected_methods, singleton_methods, define_singleton_methods

 * Module class
   class_variables, class_variables_defined?, class_variable_get,
   class_variable_set, remove_class_variable, included_modules,
   instance_methods, remove_method, method_removed, constants

 * Module class methods
   constants, nesting

Note:
Following meta-programming methods are kept in the core:

 * Module class
   alias_method, undef_method, ancestors, const_defined?, const_get,
   const_set, remove_const, method_defined?, define_method

 * Toplevel object
   define_method

`mruby-metaprog` gem is linked by default (specified in default.gembox).
When it is removed, it will save 40KB (stripped:8KB) on x86-64
environment last time I measured.

1 files changed, 2 insertions, 89 deletions

diff --git a/test/t/kernel.rb b/test/t/kernel.rb
index 561118302..9744bddba 100644
--- a/test/t/kernel.rb
+++ b/test/t/kernel.rb
@@ -103,7 +103,7 @@ assert('Kernel#__send__', '15.3.1.3.4') do
   # test with argument
   assert_true __send__(:respond_to?, :nil?)
   # test without argument and without block
-  assert_equal  Array, __send__(:public_methods).class
+  assert_equal String, __send__(:to_s).class
 end
 
 assert('Kernel#block_given?', '15.3.1.3.6') do
@@ -278,30 +278,6 @@ assert('Kernel#inspect', '15.3.1.3.17') do
   assert_equal "main", s
 end
 
-assert('Kernel#instance_variable_defined?', '15.3.1.3.20') do
-  o = Object.new
-  o.instance_variable_set(:@a, 1)
-
-  assert_true o.instance_variable_defined?("@a")
-  assert_false o.instance_variable_defined?("@b")
-  assert_true o.instance_variable_defined?("@a"[0,2])
-  assert_true o.instance_variable_defined?("@abc"[0,2])
-end
-
-assert('Kernel#instance_variables', '15.3.1.3.23') do
-  o = Object.new
-  o.instance_eval do
-    @a = 11
-    @b = 12
-  end
-  ivars = o.instance_variables
-
-  assert_equal Array, ivars.class,
-  assert_equal(2, ivars.size)
-  assert_true ivars.include?(:@a)
-  assert_true ivars.include?(:@b)
-end
-
 assert('Kernel#is_a?', '15.3.1.3.24') do
   assert_true is_a?(Kernel)
   assert_false is_a?(Array)
@@ -381,10 +357,6 @@ assert('Kernel#method_missing', '15.3.1.3.30') do
   end
 end
 
-assert('Kernel#methods', '15.3.1.3.31') do
-  assert_equal Array, methods.class
-end
-
 assert('Kernel#nil?', '15.3.1.3.32') do
   assert_false nil?
 end
@@ -408,23 +380,6 @@ end
 
 # Kernel#print is defined in mruby-print mrbgem. '15.3.1.3.35'
 
-assert('Kernel#private_methods', '15.3.1.3.36') do
-  assert_equal Array, private_methods.class
-end
-
-assert('Kernel#protected_methods', '15.3.1.3.37') do
-  assert_equal Array, protected_methods.class
-end
-
-assert('Kernel#public_methods', '15.3.1.3.38') do
-  assert_equal Array, public_methods.class
-  class Foo
-    def foo
-    end
-  end
-  assert_equal [:foo], Foo.new.public_methods(false)
-end
-
 # Kernel#puts is defined in mruby-print mrbgem. '15.3.1.3.39'
 
 assert('Kernel#raise', '15.3.1.3.40') do
@@ -496,46 +451,13 @@ assert('Kernel#send', '15.3.1.3.44') do
   # test with argument
   assert_true send(:respond_to?, :nil?)
   # test without argument and without block
-  assert_equal send(:public_methods).class, Array
-end
-
-assert('Kernel#singleton_methods', '15.3.1.3.45') do
-  assert_equal singleton_methods.class, Array
+  assert_equal send(:to_s).class, String
 end
 
 assert('Kernel#to_s', '15.3.1.3.46') do
   assert_equal to_s.class, String
 end
 
-assert('Kernel#to_s on primitives') do
-  begin
-    Fixnum.alias_method :to_s_, :to_s
-    Fixnum.remove_method :to_s
-
-    assert_nothing_raised do
-      # segfaults if mrb_cptr is used
-      1.to_s
-    end
-  ensure
-    Fixnum.alias_method :to_s, :to_s_
-    Fixnum.remove_method :to_s_
-  end
-end
-
-assert('Kernel.local_variables', '15.3.1.2.7') do
-  a, b = 0, 1
-  a += b
-
-  vars = Kernel.local_variables.sort
-  assert_equal [:a, :b, :vars], vars
-
-  assert_equal [:a, :b, :c, :vars], Proc.new { |a, b|
-    c = 2
-    # Kernel#local_variables: 15.3.1.3.28
-    local_variables.sort
-  }.call(-1, -2)
-end
-
 assert('Kernel#!=') do
   str1 = "hello"
   str2 = str1
@@ -585,15 +507,6 @@ assert('Kernel#global_variables') do
   end
 end
 
-assert('Kernel#define_singleton_method') do
-  o = Object.new
-  ret = o.define_singleton_method(:test_method) do
-    :singleton_method_ok
-  end
-  assert_equal :test_method, ret
-  assert_equal :singleton_method_ok, o.test_method
-end
-
 assert('stack extend') do
   def recurse(count, stop)
     return count if count > stop