30#ifndef _GLIBCXX_EXPERIMENTAL_UTILITY
31#define _GLIBCXX_EXPERIMENTAL_UTILITY 1
34#include <bits/uses_allocator.h>
38_GLIBCXX_BEGIN_NAMESPACE_VERSION
40namespace experimental {
41inline namespace fundamentals_v2 {
43 using erased_type = std::__erased_type;
47_GLIBCXX_END_NAMESPACE_VERSION
ISO C++ entities toplevel namespace is std.