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gcc/libstdc++-v3/include/c_global
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Jonathan Wakely 406f58e1e3 libstdc++: Add nodiscard attribute to cast-like functions 
Add [[nodiscard]] to functions that are effectively just a static_cast,
as per P2351. Also add it to std::addressof.

libstdc++-v3/ChangeLog:

	* include/bits/move.h (forward, move, move_if_noexcept)
	(addressof): Add _GLIBCXX_NODISCARD.
	* include/bits/ranges_cmp.h (identity::operator()): Add
	nodiscard attribute.
	* include/c_global/cstddef (to_integer): Likewise.
	* include/std/bit (bit_cast): Likewise.
	* include/std/utility (as_const, to_underlying): Likewise.
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cassert
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ccomplex
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cctype
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cerrno
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cfenv
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cfloat
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cinttypes
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ciso646
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climits
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clocale
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cmath
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csetjmp
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csignal
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cstdalign
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cstdarg
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cstdbool
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cstddef
libstdc++: Add nodiscard attribute to cast-like functions
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cstdint
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cstdio
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cstdlib
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cstring
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cuchar
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