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diff --git a/build-aux/snippet/arg-nonnull.h b/build-aux/snippet/arg-nonnull.h
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--- a/build-aux/snippet/arg-nonnull.h
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-/* A C macro for declaring that specific arguments must not be NULL.
- Copyright (C) 2009-2017 Free Software Foundation, Inc.
-
- This program is free software: you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
-
-/* _GL_ARG_NONNULL((n,...,m)) tells the compiler and static analyzer tools
- that the values passed as arguments n, ..., m must be non-NULL pointers.
- n = 1 stands for the first argument, n = 2 for the second argument etc. */
-#ifndef _GL_ARG_NONNULL
-# if (__GNUC__ == 3 && __GNUC_MINOR__ >= 3) || __GNUC__ > 3
-# define _GL_ARG_NONNULL(params) __attribute__ ((__nonnull__ params))
-# else
-# define _GL_ARG_NONNULL(params)
-# endif
-#endif