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-rw-r--r--include/ruby/impl/has/extension.h33
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diff --git a/include/ruby/impl/has/extension.h b/include/ruby/impl/has/extension.h
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index 02a48bc74c..0000000000
--- a/include/ruby/impl/has/extension.h
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@@ -1,33 +0,0 @@
-#ifndef RBIMPL_HAS_EXTENSION_H /*-*-C++-*-vi:se ft=cpp:*/
-#define RBIMPL_HAS_EXTENSION_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_HAS_EXTENSION.
- */
-#include "ruby/impl/has/feature.h"
-
-/** Wraps (or simulates) `__has_extension`. */
-#if defined(__has_extension)
-# define RBIMPL_HAS_EXTENSION(_) __has_extension(_)
-#else
-# /* Pre-3.0 clang had __has_feature but not __has_extension. */
-# define RBIMPL_HAS_EXTENSION(_) RBIMPL_HAS_FEATURE(_)
-#endif
-
-#endif /* RBIMPL_HAS_EXTENSION_H */