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diff --git a/include/ruby/impl/attr/noexcept.h b/include/ruby/impl/attr/noexcept.h
deleted file mode 100644
index ac0ec4c10d..0000000000
--- a/include/ruby/impl/attr/noexcept.h
+++ /dev/null
@@ -1,91 +0,0 @@
-#ifndef RBIMPL_ATTR_NOEXCEPT_H                       /*-*-C++-*-vi:se ft=cpp:*/
-#define RBIMPL_ATTR_NOEXCEPT_H
-/**
- * @file
- * @author     Ruby developers <[email protected]>
- * @copyright  This  file  is   a  part  of  the   programming  language  Ruby.
- *             Permission  is hereby  granted,  to  either redistribute  and/or
- *             modify this file, provided that  the conditions mentioned in the
- *             file COPYING are met.  Consult the file for details.
- * @warning    Symbols   prefixed  with   either  `RBIMPL`   or  `rbimpl`   are
- *             implementation details.   Don't take  them as canon.  They could
- *             rapidly appear then vanish.  The name (path) of this header file
- *             is also an  implementation detail.  Do not expect  it to persist
- *             at the place it is now.  Developers are free to move it anywhere
- *             anytime at will.
- * @note       To  ruby-core:  remember  that   this  header  can  be  possibly
- *             recursively included  from extension  libraries written  in C++.
- *             Do not  expect for  instance `__VA_ARGS__` is  always available.
- *             We assume C99  for ruby itself but we don't  assume languages of
- *             extension libraries. They could be written in C++98.
- * @brief      Defines #RBIMPL_ATTR_NOEXCEPT.
- *
- * This isn't actually an attribute in C++ but who cares...
- *
- * Mainly due  to aesthetic reasons,  this one is  rarely used in  the project.
- * But can  be handy on  occasions, especially when a  function's noexcept-ness
- * depends on its calling functions.
- *
- * ### Q&A ###
- *
- * - Q: Can a function that raises Ruby exceptions be attributed `noexcept`?
- *
- * - A: Yes.   `noexcept` is  about  C++ exceptions,  not  Ruby's.  They  don't
- *      interface each other.  You can  safely attribute a function that raises
- *      Ruby exceptions as `noexcept`.
- *
- * - Q: How, then, can I assert that  a function I wrote doesn't raise any Ruby
- *      exceptions?
- *
- * - A: `__attribute__((__leaf__))` is for that purpose.  A function attributed
- *      as leaf can still throw C++  exceptions, but not Ruby's.  Note however,
- *      that it's extremely difficult -- if  not impossible -- to assert that a
- *      function  doesn't  raise any  Ruby  exceptions  at  all.  Use  of  that
- *      attribute is not  recommended; mere mortals can't properly  use that by
- *      hand.
- *
- * - Q: Does it make sense to attribute an inline function `noexcept`?
- *
- * - A: I thought so before.  But no, I don't think they are useful any longer.
- *
- *     - When an  inline function attributed `noexcept`  actually doesn't throw
- *       any  exceptions at  all:  these days  I don't  see  any difference  in
- *       generated assembly  by adding/removing this attribute.   C++ compilers
- *       get smarter and  smarter.  Today they can infer if  it actually throws
- *       or not without any annotations by humans (correct me if I'm wrong).
- *
- *     - When an inline function attributed `noexcepr` actually _does_ throw an
- *       exception:  they  have to  call  `std::terminate`  then (C++  standard
- *       mandates  so).  This  means exception  handling routines  are actually
- *       enforced, not  omitted.  This doesn't impact  runtime performance (The
- *       Itanium C++ ABI has zero-cost  exception handling), but does impact on
- *       generated binary size.  This is bad.
- */
-#include "ruby/impl/compiler_since.h"
-#include "ruby/impl/has/feature.h"
-
-/** Wraps (or simulates) C++11 `noexcept` */
-#if ! defined(__cplusplus)
-# /* Doesn't make sense. */
-# define RBIMPL_ATTR_NOEXCEPT(_) /* void */
-
-#elif RBIMPL_HAS_FEATURE(cxx_noexcept)
-# define RBIMPL_ATTR_NOEXCEPT(_) noexcept(noexcept(_))
-
-#elif defined(__GXX_EXPERIMENTAL_CXX0X__) && __GXX_EXPERIMENTAL_CXX0X__
-# define RBIMPL_ATTR_NOEXCEPT(_) noexcept(noexcept(_))
-
-#elif defined(__INTEL_CXX11_MODE__)
-# define RBIMPL_ATTR_NOEXCEPT(_) noexcept(noexcept(_))
-
-#elif RBIMPL_COMPILER_SINCE(MSVC, 19, 0, 0)
-# define RBIMPL_ATTR_NOEXCEPT(_) noexcept(noexcept(_))
-
-#elif __cplusplus >= 201103L
-# define RBIMPL_ATTR_NOEXCEPT(_) noexcept(noexcept(_))
-
-#else
-# define RBIMPL_ATTR_NOEXCEPT(_) /* void */
-#endif
-
-#endif /* RBIMPL_ATTR_NOEXCEPT_H */