1 files changed, 41 insertions, 0 deletions
diff --git a/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/types.compile.pass.cpp b/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/types.compile.pass.cpp
new file mode 100644
index 000000000000..7cf8393111b5
--- /dev/null
+++ b/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/types.compile.pass.cpp
@@ -0,0 +1,41 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+// UNSUPPORTED: no-threads
+
+// <thread>
+
+// template<class charT> struct formatter<thread::id, charT>;
+
+// [format.formatter.spec]/4
+//   If the library provides an explicit or partial specialization of
+//   formatter<T, charT>, that specialization is enabled and meets the
+//   Formatter requirements except as noted otherwise.
+//
+// Test parts of the BasicFormatter requirements. Like the formattable concept
+// it uses the semiregular concept. This test does not use the formattable
+// concept since the intent is for the formatter to be available without
+// including the <format> header.
+
+// TODO FMT Evaluate what to do with [format.formatter.spec]/2
+// [format.formatter.spec]/2
+//   Each header that declares the template formatter provides the following
+//   enabled specializations:
+// Then there is a list of formatters, but is that really useful?
+// Note this should be discussed in LEWG.
+
+#include <concepts>
+#include <thread>
+
+#include "test_macros.h"
+
+static_assert(std::semiregular<std::formatter<std::thread::id, char>>);
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+static_assert(std::semiregular<std::formatter<std::thread::id, wchar_t>>);
+#endif