4 files changed, 14 insertions, 43 deletions
diff --git a/mrbgems/mruby-kernel-ext/mrbgem.rake b/mrbgems/mruby-kernel-ext/mrbgem.rake
index fcb3a83b0..e52c63a55 100644
--- a/mrbgems/mruby-kernel-ext/mrbgem.rake
+++ b/mrbgems/mruby-kernel-ext/mrbgem.rake
@@ -1,5 +1,5 @@
 MRuby::Gem::Specification.new('mruby-kernel-ext') do |spec|
   spec.license = 'MIT'
   spec.author  = 'mruby developers'
-  spec.summary = 'Kernel module extension'
+  spec.summary = 'extensional function-like methods'
 end
diff --git a/mrbgems/mruby-kernel-ext/mrblib/kernel.rb b/mrbgems/mruby-kernel-ext/mrblib/kernel.rb
deleted file mode 100644
index bf739ed1a..000000000
--- a/mrbgems/mruby-kernel-ext/mrblib/kernel.rb
+++ /dev/null
@@ -1,15 +0,0 @@
-module Kernel
-  # call-seq:
-  #   obj.yield_self {|_obj|...} -> an_object
-  #   obj.then {|_obj|...}       -> an_object
-  #
-  # Yields <i>obj</i> and returns the result.
-  #
-  #   'my string'.yield_self {|s|s.upcase} #=> "MY STRING"
-  #
-  def yield_self(&block)
-    return to_enum :yield_self unless block
-    block.call(self)
-  end
-  alias then yield_self
-end
diff --git a/mrbgems/mruby-kernel-ext/src/kernel.c b/mrbgems/mruby-kernel-ext/src/kernel.c
index 99affbfa4..376751e10 100644
--- a/mrbgems/mruby-kernel-ext/src/kernel.c
+++ b/mrbgems/mruby-kernel-ext/src/kernel.c
@@ -22,7 +22,7 @@ mrb_f_caller(mrb_state *mrb, mrb_value self)
     case 1:
       if (mrb_type(v) == MRB_TT_RANGE) {
         mrb_int beg, len;
-        if (mrb_range_beg_len(mrb, v, &beg, &len, bt_len, TRUE) == 1) {
+        if (mrb_range_beg_len(mrb, v, &beg, &len, bt_len, TRUE) == MRB_RANGE_OK) {
           lev = beg;
           n = len;
         }
@@ -31,22 +31,21 @@ mrb_f_caller(mrb_state *mrb, mrb_value self)
         }
       }
       else {
-        v = mrb_to_int(mrb, v);
-        lev = mrb_fixnum(v);
+        lev = mrb_int(mrb, v);
         if (lev < 0) {
-          mrb_raisef(mrb, E_ARGUMENT_ERROR, "negative level (%S)", v);
+          mrb_raisef(mrb, E_ARGUMENT_ERROR, "negative level (%v)", v);
         }
         n = bt_len - lev;
       }
       break;
     case 2:
-      lev = mrb_fixnum(mrb_to_int(mrb, v));
-      n = mrb_fixnum(mrb_to_int(mrb, length));
+      lev = mrb_int(mrb, v);
+      n = mrb_int(mrb, length);
       if (lev < 0) {
-        mrb_raisef(mrb, E_ARGUMENT_ERROR, "negative level (%S)", v);
+        mrb_raisef(mrb, E_ARGUMENT_ERROR, "negative level (%v)", v);
       }
       if (n < 0) {
-        mrb_raisef(mrb, E_ARGUMENT_ERROR, "negative size (%S)", length);
+        mrb_raisef(mrb, E_ARGUMENT_ERROR, "negative size (%v)", length);
       }
       break;
     default:
@@ -206,22 +205,6 @@ mrb_f_hash(mrb_state *mrb, mrb_value self)
   return mrb_ensure_hash_type(mrb, arg);
 }
 
-/*
- *  call-seq:
- *     obj.itself -> an_object
- *
- *  Returns <i>obj</i>.
- *
- *      string = 'my string' #=> "my string"
- *      string.itself.object_id == string.object_id #=> true
- *
- */
-static mrb_value
-mrb_f_itself(mrb_state *mrb, mrb_value self)
-{
-  return self;
-}
-
 void
 mrb_mruby_kernel_ext_gem_init(mrb_state *mrb)
 {
@@ -237,7 +220,6 @@ mrb_mruby_kernel_ext_gem_init(mrb_state *mrb)
   mrb_define_module_function(mrb, krn, "String", mrb_f_string, MRB_ARGS_REQ(1));
   mrb_define_module_function(mrb, krn, "Array", mrb_f_array, MRB_ARGS_REQ(1));
   mrb_define_module_function(mrb, krn, "Hash", mrb_f_hash, MRB_ARGS_REQ(1));
-  mrb_define_module_function(mrb, krn, "itself", mrb_f_itself, MRB_ARGS_NONE());
 }
 
 void
diff --git a/mrbgems/mruby-kernel-ext/test/kernel.rb b/mrbgems/mruby-kernel-ext/test/kernel.rb
index 206b7ac74..ad9177165 100644
--- a/mrbgems/mruby-kernel-ext/test/kernel.rb
+++ b/mrbgems/mruby-kernel-ext/test/kernel.rb
@@ -49,21 +49,25 @@ assert('Kernel#__method__') do
 end
 
 assert('Kernel#Integer') do
-  assert_equal(123, Integer(123.999)) if class_defined?("Float")
   assert_equal(26, Integer("0x1a"))
   assert_equal(930, Integer("0930", 10))
   assert_equal(7, Integer("111", 2))
   assert_equal(0, Integer("0"))
   assert_equal(0, Integer("00000"))
   assert_raise(TypeError) { Integer(nil) }
+  skip unless Object.const_defined?(:Float)
+  assert_equal(123, Integer(123.999))
 end
 
 assert('Kernel#Float') do
+  skip unless Object.const_defined?(:Float)
   assert_equal(1.0, Float(1))
   assert_equal(123.456, Float(123.456))
   assert_equal(123.456, Float("123.456"))
   assert_raise(TypeError) { Float(nil) }
-end if class_defined?("Float")
+  assert_raise(ArgumentError) { Float("1.5a") }
+  assert_raise(ArgumentError) { Float("1.5\0") }
+end
 
 assert('Kernel#String') do
   assert_equal("main", String(self))