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