=begin
なかだです。

メソッド再定義で警告を出すときに、上書きされるほうの定義の場所も
出してはどうでしょうか。

Index: proc.c¶

--- proc.c (revision 25152)
+++ proc.c (working copy)
@@ -649,6 +649,8 @@ rb_proc_arity(VALUE self)
}

-static rb_iseq_t *
-get_proc_iseq(VALUE self, int *is_proc)
+#define get_proc_iseq rb_proc_get_iseq
+
+rb_iseq_t *
+rb_proc_get_iseq(VALUE self, int *is_proc)
{
rb_proc_t *proc;
Index: vm_method.c¶

--- vm_method.c (revision 25152)
+++ vm_method.c (working copy)
@@ -189,5 +189,24 @@ rb_add_method_def(VALUE klass, ID mid, r
old_def->type != VM_METHOD_TYPE_UNDEF &&
old_def->type != VM_METHOD_TYPE_ZSUPER) {

•  extern rb_iseq_t *rb_proc_get_iseq(VALUE proc, int *is_proc);
  

•  rb_iseq_t *iseq = 0;
  

•  rb_warning("method redefined; discarding old %s", rb_id2name(mid));
  

•  switch (old_def->type) {
  

•    case VM_METHOD_TYPE_ISEQ:
  

•  iseq = old_def->body.iseq;
  

•  break;
  

•    case VM_METHOD_TYPE_BMETHOD:
  

•  iseq = rb_proc_get_iseq(old_def->body.proc, 0);
  

•  break;
  

•    default:
  

•  break;
  

•  }
  

•  if (iseq && !NIL_P(iseq->filename)) {
  

•  int line = iseq->insn_info_table ? rb_iseq_first_lineno(iseq) : 0;
  

•  rb_compile_warning(RSTRING_PTR(iseq->filename), line,
  

•  		   "previous definition of %s was here",
  

•  		   rb_id2name(old_def->original_id));
  

•  }
  

  }
  rb_free_method_entry(old_me);
  Index: test/ruby/test_class.rb
  ===================================================================
  --- test/ruby/test_class.rb (revision 25152)
  +++ test/ruby/test_class.rb (working copy)
  @@ -115,4 +115,5 @@ class TestClass < Test::Unit::TestCase
  end
  assert_match(/:#{line}: warning: method redefined; discarding old foo/, stderr)

• assert_match(/:#{line-1}: warning: previous definition of foo/, stderr)

  stderr = EnvUtil.verbose_warning do
  @@ -142,4 +143,5 @@ class TestClass < Test::Unit::TestCase
  end
  assert_match(/:#{line}: warning: method redefined; discarding old foo/, stderr)

• assert_match(/:#{line-1}: warning: previous definition of foo/, stderr)

  stderr = EnvUtil.verbose_warning do
  Index: test/ruby/test_module.rb
  ===================================================================
  --- test/ruby/test_module.rb (revision 25152)
  +++ test/ruby/test_module.rb (working copy)
  @@ -797,4 +797,5 @@ class TestModule < Test::Unit::TestCase
  end
  assert_match(/:#{line}: warning: method redefined; discarding old foo/, stderr)

• assert_match(/:#{line-1}: warning: previous definition of foo/, stderr)

  stderr = EnvUtil.verbose_warning do
  @@ -824,4 +825,5 @@ class TestModule < Test::Unit::TestCase
  end
  assert_match(/:#{line}: warning: method redefined; discarding old foo/, stderr)

• assert_match(/:#{line-1}: warning: previous definition of foo/, stderr)

  stderr = EnvUtil.verbose_warning do
  

--
--- 僕の前にBugはない。
--- 僕の後ろにBugはできる。
中田 伸悦
=end