Move `__method__` to mruby-kernel-ext since it's not ISO method.

mrbgems/mruby-kernel-ext/src/kernel.c

 #include "mruby.h"
 #include "mruby/error.h"
 
+/*
+ *  call-seq:
+ *     __method__         -> symbol
+ *
+ *  Returns the name at the definition of the current method as a
+ *  Symbol.
+ *  If called outside of a method, it returns <code>nil</code>.
+ *
+ */
+static mrb_value
+mrb_f_method(mrb_state *mrb, mrb_value self)
+{
+  mrb_callinfo *ci = mrb->c->ci;
+  ci--;
+  if (ci->mid)
+    return mrb_symbol_value(ci->mid);
+  else
+    return mrb_nil_value();
+}
+
 void
 mrb_mruby_kernel_ext_gem_init(mrb_state *mrb)
 {
   struct RClass *krn = mrb->kernel_module;
 
   mrb_define_module_function(mrb, krn, "fail", mrb_f_raise, MRB_ARGS_NONE());
+  mrb_define_method(mrb, krn, "__method__", mrb_f_method, MRB_ARGS_NONE());
 }
 
 void

mrbgems/mruby-kernel-ext/test/kernel.rb

@@ -2,3 +2,17 @@ assert('Kernel.fail, Kernel#fail') do
   assert_raise(RuntimeError) { fail }
   assert_raise(RuntimeError) { Kernel.fail }
 end
+
+assert('Kernel#__method__') do
+  assert_equal(:m, Class.new {def m; __method__; end}.new.m)
+  assert_equal(:m, Class.new {define_method(:m) {__method__}}.new.m)
+  c = Class.new do
+    [:m1, :m2].each do |m|
+      define_method(m) do
+        __method__
+      end
+    end
+  end
+  assert_equal(:m1, c.new.m1)
+  assert_equal(:m2, c.new.m2)
+end

src/kernel.c

@@ -210,26 +210,6 @@ mrb_f_block_given_p_m(mrb_state *mrb, mrb_value self)
   return mrb_bool_value(given_p);
 }
 
-/*
- *  call-seq:
- *     __method__         -> symbol
- *
- *  Returns the name at the definition of the current method as a
- *  Symbol.
- *  If called outside of a method, it returns <code>nil</code>.
- *
- */
-static mrb_value
-mrb_f_method(mrb_state *mrb, mrb_value self)
-{
-  mrb_callinfo *ci = mrb->c->ci;
-  ci--;
-  if (ci->mid)
-    return mrb_symbol_value(ci->mid);
-  else
-    return mrb_nil_value();
-}
-
 /* 15.3.1.3.7  */
 /*
  *  call-seq:
@@ -1153,7 +1133,6 @@ mrb_init_kernel(mrb_state *mrb)
   mrb_define_method(mrb, krn, "===",                        mrb_equal_m,                     MRB_ARGS_REQ(1));    /* 15.3.1.3.2  */
   mrb_define_method(mrb, krn, "__id__",                     mrb_obj_id_m,                    MRB_ARGS_NONE());    /* 15.3.1.3.3  */
   mrb_define_method(mrb, krn, "__send__",                   mrb_f_send,                      MRB_ARGS_ANY());     /* 15.3.1.3.4  */
-  mrb_define_method(mrb, krn, "__method__",                 mrb_f_method,                    MRB_ARGS_NONE());
   mrb_define_method(mrb, krn, "block_given?",               mrb_f_block_given_p_m,           MRB_ARGS_NONE());    /* 15.3.1.3.6  */
   mrb_define_method(mrb, krn, "class",                      mrb_obj_class_m,                 MRB_ARGS_NONE());    /* 15.3.1.3.7  */
   mrb_define_method(mrb, krn, "clone",                      mrb_obj_clone,                   MRB_ARGS_NONE());    /* 15.3.1.3.8  */

test/t/kernel.rb

@@ -528,20 +528,6 @@ assert('Kernel#global_variables') do
   end
 end
 
-assert('Kernel#__method__') do
-  assert_equal(:m, Class.new {def m; __method__; end}.new.m)
-  assert_equal(:m, Class.new {define_method(:m) {__method__}}.new.m)
-  c = Class.new do
-    [:m1, :m2].each do |m|
-      define_method(m) do
-        __method__
-      end
-    end
-  end
-  assert_equal(:m1, c.new.m1)
-  assert_equal(:m2, c.new.m2)
-end
-
 assert('Kernel#define_singleton_method') do
   o = Object.new
   ret = o.define_singleton_method(:test_method) do