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Tests for P1831 and workaround for DevCom-10948908 #5670

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9dde47e
Workaround for DevCom-10948908 and tests for P1831
YexuanXiao Aug 9, 2025
7167658
Use preprocessing protection workaround
YexuanXiao Aug 9, 2025
1e7b916
Minor improves
YexuanXiao Aug 10, 2025
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41 changes: 39 additions & 2 deletions stl/inc/utility
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Original file line number Diff line number Diff line change
Expand Up @@ -613,11 +613,36 @@ struct _Tuple_size_sfinae<_Tuple, void_t<decltype(tuple_size<_Tuple>::value)>>
template <class _Tuple>
struct tuple_size<const _Tuple> : _Tuple_size_sfinae<_Tuple> {}; // ignore cv

// TRANSITION, DevCom-10948908, Clang fixed in 21: the [[deprecated]] attribute of a class template specialization
// has no effect
// See the specialization of tuple_size for volatile _Tuple
#if _HAS_CXX20 // vvv workaround vvv
template <class _Tuple>
struct _Tuple_size_sfinae<volatile _Tuple, void_t<decltype(tuple_size<_Tuple>::value)>>
: integral_constant<size_t, tuple_size<_Tuple>::value> {
_CXX20_DEPRECATE_VOLATILE static constexpr size_t value =
integral_constant<size_t, tuple_size<_Tuple>::value>::value;
};

template <class _Tuple>
struct _Tuple_size_sfinae<const volatile _Tuple, void_t<decltype(tuple_size<_Tuple>::value)>>
: integral_constant<size_t, tuple_size<_Tuple>::value> {
_CXX20_DEPRECATE_VOLATILE static constexpr size_t value =
integral_constant<size_t, tuple_size<_Tuple>::value>::value;
};

template <class _Tuple>
struct _CXX20_DEPRECATE_VOLATILE tuple_size<volatile _Tuple> : _Tuple_size_sfinae<volatile _Tuple> {};

template <class _Tuple>
struct _CXX20_DEPRECATE_VOLATILE tuple_size<const volatile _Tuple> : _Tuple_size_sfinae<const volatile _Tuple> {};
#else // ^^^ workaround / no workaround vvv
template <class _Tuple>
struct _CXX20_DEPRECATE_VOLATILE tuple_size<volatile _Tuple> : _Tuple_size_sfinae<_Tuple> {}; // ignore cv

template <class _Tuple>
struct _CXX20_DEPRECATE_VOLATILE tuple_size<const volatile _Tuple> : _Tuple_size_sfinae<_Tuple> {}; // ignore cv
#endif // ^^^ no workaround ^^^

template <size_t _Index, class _Tuple>
struct _MSVC_KNOWN_SEMANTICS tuple_element<_Index, const _Tuple> : tuple_element<_Index, _Tuple> {
Expand All @@ -628,15 +653,27 @@ struct _MSVC_KNOWN_SEMANTICS tuple_element<_Index, const _Tuple> : tuple_element
template <size_t _Index, class _Tuple>
struct _CXX20_DEPRECATE_VOLATILE _MSVC_KNOWN_SEMANTICS tuple_element<_Index, volatile _Tuple>
: tuple_element<_Index, _Tuple> {
// TRANSITION, DevCom-10948908, Clang fixed in 21: the [[deprecated]] attribute of a class template specialization
// has no effect
#if _HAS_CXX20 // vvv workaround vvv
using _Mybase _CXX20_DEPRECATE_VOLATILE = tuple_element<_Index, _Tuple>;
#else // ^^^ workaround / no workaround vvv
using _Mybase = tuple_element<_Index, _Tuple>;
using type = add_volatile_t<typename _Mybase::type>;
#endif // ^^^ no workaround ^^^
using type = add_volatile_t<typename _Mybase::type>;
};

template <size_t _Index, class _Tuple>
struct _CXX20_DEPRECATE_VOLATILE _MSVC_KNOWN_SEMANTICS tuple_element<_Index, const volatile _Tuple>
: tuple_element<_Index, _Tuple> {
// TRANSITION, DevCom-10948908, Clang fixed in 21: the [[deprecated]] attribute of a class template specialization
// has no effect
#if _HAS_CXX20 // vvv workaround vvv
using _Mybase _CXX20_DEPRECATE_VOLATILE = tuple_element<_Index, _Tuple>;
#else // ^^^ workaround / no workaround vvv
using _Mybase = tuple_element<_Index, _Tuple>;
using type = add_cv_t<typename _Mybase::type>;
#endif // ^^^ no workaround ^^^
using type = add_cv_t<typename _Mybase::type>;
};

template <class _Ty, size_t _Size>
Expand Down
30 changes: 28 additions & 2 deletions stl/inc/variant
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Original file line number Diff line number Diff line change
Expand Up @@ -290,9 +290,21 @@ struct variant_size; // undefined
template <class _Ty>
struct variant_size<const _Ty> : variant_size<_Ty>::type {};
template <class _Ty>
struct _CXX20_DEPRECATE_VOLATILE variant_size<volatile _Ty> : variant_size<_Ty>::type {};
struct _CXX20_DEPRECATE_VOLATILE variant_size<volatile _Ty> : variant_size<_Ty>::type {
// TRANSITION, DevCom-10948908, Clang fixed in 21: the [[deprecated]] attribute of a class template specialization
// has no effect
#if _HAS_CXX20 // vvv workaround vvv
_CXX20_DEPRECATE_VOLATILE static constexpr size_t value = variant_size<_Ty>::type::value;
#endif // ^^^ no workaround ^^^
};
template <class _Ty>
struct _CXX20_DEPRECATE_VOLATILE variant_size<const volatile _Ty> : variant_size<_Ty>::type {};
struct _CXX20_DEPRECATE_VOLATILE variant_size<const volatile _Ty> : variant_size<_Ty>::type {
// TRANSITION, DevCom-10948908, Clang fixed in 21: the [[deprecated]] attribute of a class template specialization
// has no effect
#if _HAS_CXX20 // vvv workaround vvv
_CXX20_DEPRECATE_VOLATILE static constexpr size_t value = variant_size<_Ty>::type::value;
#endif // ^^^ no workaround ^^^
};
_EXPORT_STD template <class _Ty>
constexpr size_t variant_size_v = variant_size<_Ty>::value;

Expand All @@ -309,11 +321,25 @@ struct variant_alternative<_Idx, const _Ty> {
};
template <size_t _Idx, class _Ty>
struct _CXX20_DEPRECATE_VOLATILE variant_alternative<_Idx, volatile _Ty> {
// TRANSITION, DevCom-10948908, Clang fixed in 21: the [[deprecated]] attribute of a class template specialization
// has no effect
#if _HAS_CXX20 // vvv workaround vvv
using _Mybase _CXX20_DEPRECATE_VOLATILE = variant_alternative<_Idx, _Ty>;
using type = add_volatile_t<typename _Mybase::type>;
#else // ^^^ workaround / no workaround vvv
using type = add_volatile_t<variant_alternative_t<_Idx, _Ty>>;
#endif // ^^^ no workaround ^^^
};
template <size_t _Idx, class _Ty>
struct _CXX20_DEPRECATE_VOLATILE variant_alternative<_Idx, const volatile _Ty> {
// TRANSITION, DevCom-10948908, Clang fixed in 21: the [[deprecated]] attribute of a class template specialization
// has no effect
#if _HAS_CXX20 // vvv workaround vvv
using _Mybase _CXX20_DEPRECATE_VOLATILE = variant_alternative<_Idx, _Ty>;
using type = add_cv_t<typename _Mybase::type>;
#else // ^^^ workaround / no workaround vvv
using type = add_cv_t<variant_alternative_t<_Idx, _Ty>>;
#endif // ^^^ no workaround ^^^
};
template <size_t _Idx, class... _Types>
struct variant_alternative<_Idx, variant<_Types...>> {
Expand Down
194 changes: 194 additions & 0 deletions tests/std/expected_results.txt
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@@ -1,2 +1,196 @@
# Copyright (c) Microsoft Corporation.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

# These tests are expected to fail under /WX

tests/P1831R1_cpp20_volatile:00 FAIL
tests/P1831R1_cpp20_volatile:01 FAIL
tests/P1831R1_cpp20_volatile:02 FAIL
tests/P1831R1_cpp20_volatile:03 FAIL
tests/P1831R1_cpp20_volatile:04 FAIL
tests/P1831R1_cpp20_volatile:05 FAIL
tests/P1831R1_cpp20_volatile:06 FAIL
tests/P1831R1_cpp20_volatile:07 FAIL
tests/P1831R1_cpp20_volatile:08 FAIL
tests/P1831R1_cpp20_volatile:09 FAIL
tests/P1831R1_cpp20_volatile:10 FAIL
tests/P1831R1_cpp20_volatile:11 FAIL
tests/P1831R1_cpp20_volatile:12 FAIL
tests/P1831R1_cpp20_volatile:13 FAIL
tests/P1831R1_cpp20_volatile:16 FAIL
tests/P1831R1_cpp20_volatile:17 FAIL
tests/P1831R1_cpp20_volatile:18 FAIL
tests/P1831R1_cpp20_volatile:19 FAIL
tests/P1831R1_cpp20_volatile:20 FAIL
tests/P1831R1_cpp20_volatile:21 FAIL
tests/P1831R1_cpp20_volatile:22 FAIL
tests/P1831R1_cpp20_volatile:29 FAIL
tests/P1831R1_cpp20_volatile:30 FAIL

tests/P1831R1_cpp20_volatile1:00 FAIL
tests/P1831R1_cpp20_volatile1:01 FAIL
tests/P1831R1_cpp20_volatile1:02 FAIL
tests/P1831R1_cpp20_volatile1:03 FAIL
tests/P1831R1_cpp20_volatile1:04 FAIL
tests/P1831R1_cpp20_volatile1:05 FAIL
tests/P1831R1_cpp20_volatile1:06 FAIL
tests/P1831R1_cpp20_volatile1:07 FAIL
tests/P1831R1_cpp20_volatile1:08 FAIL
tests/P1831R1_cpp20_volatile1:09 FAIL
tests/P1831R1_cpp20_volatile1:10 FAIL
tests/P1831R1_cpp20_volatile1:11 FAIL
tests/P1831R1_cpp20_volatile1:12 FAIL
tests/P1831R1_cpp20_volatile1:13 FAIL
tests/P1831R1_cpp20_volatile1:16 FAIL
tests/P1831R1_cpp20_volatile1:17 FAIL
tests/P1831R1_cpp20_volatile1:18 FAIL
tests/P1831R1_cpp20_volatile1:19 FAIL
tests/P1831R1_cpp20_volatile1:20 FAIL
tests/P1831R1_cpp20_volatile1:21 FAIL
tests/P1831R1_cpp20_volatile1:22 FAIL
tests/P1831R1_cpp20_volatile1:29 FAIL
tests/P1831R1_cpp20_volatile1:30 FAIL

tests/P1831R1_cpp20_volatile2:00 FAIL
tests/P1831R1_cpp20_volatile2:01 FAIL
tests/P1831R1_cpp20_volatile2:02 FAIL
tests/P1831R1_cpp20_volatile2:03 FAIL
tests/P1831R1_cpp20_volatile2:04 FAIL
tests/P1831R1_cpp20_volatile2:05 FAIL
tests/P1831R1_cpp20_volatile2:06 FAIL
tests/P1831R1_cpp20_volatile2:07 FAIL
tests/P1831R1_cpp20_volatile2:08 FAIL
tests/P1831R1_cpp20_volatile2:09 FAIL
tests/P1831R1_cpp20_volatile2:10 FAIL
tests/P1831R1_cpp20_volatile2:11 FAIL
tests/P1831R1_cpp20_volatile2:12 FAIL
tests/P1831R1_cpp20_volatile2:13 FAIL
tests/P1831R1_cpp20_volatile2:16 FAIL
tests/P1831R1_cpp20_volatile2:17 FAIL
tests/P1831R1_cpp20_volatile2:18 FAIL
tests/P1831R1_cpp20_volatile2:19 FAIL
tests/P1831R1_cpp20_volatile2:20 FAIL
tests/P1831R1_cpp20_volatile2:21 FAIL
tests/P1831R1_cpp20_volatile2:22 FAIL
tests/P1831R1_cpp20_volatile2:29 FAIL
tests/P1831R1_cpp20_volatile2:30 FAIL

tests/P1831R1_cpp20_volatile3:00 FAIL
tests/P1831R1_cpp20_volatile3:01 FAIL
tests/P1831R1_cpp20_volatile3:02 FAIL
tests/P1831R1_cpp20_volatile3:03 FAIL
tests/P1831R1_cpp20_volatile3:04 FAIL
tests/P1831R1_cpp20_volatile3:05 FAIL
tests/P1831R1_cpp20_volatile3:06 FAIL
tests/P1831R1_cpp20_volatile3:07 FAIL
tests/P1831R1_cpp20_volatile3:08 FAIL
tests/P1831R1_cpp20_volatile3:09 FAIL
tests/P1831R1_cpp20_volatile3:10 FAIL
tests/P1831R1_cpp20_volatile3:11 FAIL
tests/P1831R1_cpp20_volatile3:12 FAIL
tests/P1831R1_cpp20_volatile3:13 FAIL
tests/P1831R1_cpp20_volatile3:16 FAIL
tests/P1831R1_cpp20_volatile3:17 FAIL
tests/P1831R1_cpp20_volatile3:18 FAIL
tests/P1831R1_cpp20_volatile3:19 FAIL
tests/P1831R1_cpp20_volatile3:20 FAIL
tests/P1831R1_cpp20_volatile3:21 FAIL
tests/P1831R1_cpp20_volatile3:22 FAIL
tests/P1831R1_cpp20_volatile3:29 FAIL
tests/P1831R1_cpp20_volatile3:30 FAIL

tests/P1831R1_cpp20_volatile4:00 FAIL
tests/P1831R1_cpp20_volatile4:01 FAIL
tests/P1831R1_cpp20_volatile4:02 FAIL
tests/P1831R1_cpp20_volatile4:03 FAIL
tests/P1831R1_cpp20_volatile4:04 FAIL
tests/P1831R1_cpp20_volatile4:05 FAIL
tests/P1831R1_cpp20_volatile4:06 FAIL
tests/P1831R1_cpp20_volatile4:07 FAIL
tests/P1831R1_cpp20_volatile4:08 FAIL
tests/P1831R1_cpp20_volatile4:09 FAIL
tests/P1831R1_cpp20_volatile4:10 FAIL
tests/P1831R1_cpp20_volatile4:11 FAIL
tests/P1831R1_cpp20_volatile4:12 FAIL
tests/P1831R1_cpp20_volatile4:13 FAIL
tests/P1831R1_cpp20_volatile4:16 FAIL
tests/P1831R1_cpp20_volatile4:17 FAIL
tests/P1831R1_cpp20_volatile4:18 FAIL
tests/P1831R1_cpp20_volatile4:19 FAIL
tests/P1831R1_cpp20_volatile4:20 FAIL
tests/P1831R1_cpp20_volatile4:21 FAIL
tests/P1831R1_cpp20_volatile4:22 FAIL
tests/P1831R1_cpp20_volatile4:29 FAIL
tests/P1831R1_cpp20_volatile4:30 FAIL

tests/P1831R1_cpp20_volatile5:00 FAIL
tests/P1831R1_cpp20_volatile5:01 FAIL
tests/P1831R1_cpp20_volatile5:02 FAIL
tests/P1831R1_cpp20_volatile5:03 FAIL
tests/P1831R1_cpp20_volatile5:04 FAIL
tests/P1831R1_cpp20_volatile5:05 FAIL
tests/P1831R1_cpp20_volatile5:06 FAIL
tests/P1831R1_cpp20_volatile5:07 FAIL
tests/P1831R1_cpp20_volatile5:08 FAIL
tests/P1831R1_cpp20_volatile5:09 FAIL
tests/P1831R1_cpp20_volatile5:10 FAIL
tests/P1831R1_cpp20_volatile5:11 FAIL
tests/P1831R1_cpp20_volatile5:12 FAIL
tests/P1831R1_cpp20_volatile5:13 FAIL
tests/P1831R1_cpp20_volatile5:16 FAIL
tests/P1831R1_cpp20_volatile5:17 FAIL
tests/P1831R1_cpp20_volatile5:18 FAIL
tests/P1831R1_cpp20_volatile5:19 FAIL
tests/P1831R1_cpp20_volatile5:20 FAIL
tests/P1831R1_cpp20_volatile5:21 FAIL
tests/P1831R1_cpp20_volatile5:22 FAIL
tests/P1831R1_cpp20_volatile5:29 FAIL
tests/P1831R1_cpp20_volatile5:30 FAIL

tests/P1831R1_cpp20_volatile6:00 FAIL
tests/P1831R1_cpp20_volatile6:01 FAIL
tests/P1831R1_cpp20_volatile6:02 FAIL
tests/P1831R1_cpp20_volatile6:03 FAIL
tests/P1831R1_cpp20_volatile6:04 FAIL
tests/P1831R1_cpp20_volatile6:05 FAIL
tests/P1831R1_cpp20_volatile6:06 FAIL
tests/P1831R1_cpp20_volatile6:07 FAIL
tests/P1831R1_cpp20_volatile6:08 FAIL
tests/P1831R1_cpp20_volatile6:09 FAIL
tests/P1831R1_cpp20_volatile6:10 FAIL
tests/P1831R1_cpp20_volatile6:11 FAIL
tests/P1831R1_cpp20_volatile6:12 FAIL
tests/P1831R1_cpp20_volatile6:13 FAIL
tests/P1831R1_cpp20_volatile6:16 FAIL
tests/P1831R1_cpp20_volatile6:17 FAIL
tests/P1831R1_cpp20_volatile6:18 FAIL
tests/P1831R1_cpp20_volatile6:19 FAIL
tests/P1831R1_cpp20_volatile6:20 FAIL
tests/P1831R1_cpp20_volatile6:21 FAIL
tests/P1831R1_cpp20_volatile6:22 FAIL
tests/P1831R1_cpp20_volatile6:29 FAIL
tests/P1831R1_cpp20_volatile6:30 FAIL

tests/P1831R1_cpp20_volatile7:00 FAIL
tests/P1831R1_cpp20_volatile7:01 FAIL
tests/P1831R1_cpp20_volatile7:02 FAIL
tests/P1831R1_cpp20_volatile7:03 FAIL
tests/P1831R1_cpp20_volatile7:04 FAIL
tests/P1831R1_cpp20_volatile7:05 FAIL
tests/P1831R1_cpp20_volatile7:06 FAIL
tests/P1831R1_cpp20_volatile7:07 FAIL
tests/P1831R1_cpp20_volatile7:08 FAIL
tests/P1831R1_cpp20_volatile7:09 FAIL
tests/P1831R1_cpp20_volatile7:10 FAIL
tests/P1831R1_cpp20_volatile7:11 FAIL
tests/P1831R1_cpp20_volatile7:12 FAIL
tests/P1831R1_cpp20_volatile7:13 FAIL
tests/P1831R1_cpp20_volatile7:16 FAIL
tests/P1831R1_cpp20_volatile7:17 FAIL
tests/P1831R1_cpp20_volatile7:18 FAIL
tests/P1831R1_cpp20_volatile7:19 FAIL
tests/P1831R1_cpp20_volatile7:20 FAIL
tests/P1831R1_cpp20_volatile7:21 FAIL
tests/P1831R1_cpp20_volatile7:22 FAIL
tests/P1831R1_cpp20_volatile7:29 FAIL
tests/P1831R1_cpp20_volatile7:30 FAIL
8 changes: 8 additions & 0 deletions tests/std/test.lst
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Expand Up @@ -621,6 +621,14 @@ tests\P1645R1_constexpr_numeric
tests\P1659R3_ranges_alg_ends_with
tests\P1659R3_ranges_alg_starts_with
tests\P1682R3_to_underlying
tests\P1831R1_cpp20_volatile
tests\P1831R1_cpp20_volatile1
tests\P1831R1_cpp20_volatile2
tests\P1831R1_cpp20_volatile3
tests\P1831R1_cpp20_volatile4
tests\P1831R1_cpp20_volatile5
tests\P1831R1_cpp20_volatile6
tests\P1831R1_cpp20_volatile7
tests\P1899R3_views_stride
tests\P1899R3_views_stride_death
tests\P1951R1_default_arguments_pair_forward_ctor
Expand Down
4 changes: 4 additions & 0 deletions tests/std/tests/P1831R1_cpp20_volatile/env.lst
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@@ -0,0 +1,4 @@
# Copyright (c) Microsoft Corporation.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

RUNALL_INCLUDE ..\usual_20_matrix.lst
8 changes: 8 additions & 0 deletions tests/std/tests/P1831R1_cpp20_volatile/volatile_tuple_size.test.cpp
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// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#include <tuple>

int main() {
static_assert(std::tuple_size_v<volatile std::tuple<int>> == 1);
}
8 changes: 8 additions & 0 deletions tests/std/tests/P1831R1_cpp20_volatile1/const_volatile_tuple_size.test.cpp
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@@ -0,0 +1,8 @@
// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#include <tuple>

int main() {
static_assert(std::tuple_size_v<const volatile std::tuple<int>> == 1);
}
4 changes: 4 additions & 0 deletions tests/std/tests/P1831R1_cpp20_volatile1/env.lst
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# Copyright (c) Microsoft Corporation.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

RUNALL_INCLUDE ..\usual_20_matrix.lst
4 changes: 4 additions & 0 deletions tests/std/tests/P1831R1_cpp20_volatile2/env.lst
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@@ -0,0 +1,4 @@
# Copyright (c) Microsoft Corporation.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

RUNALL_INCLUDE ..\usual_20_matrix.lst
9 changes: 9 additions & 0 deletions tests/std/tests/P1831R1_cpp20_volatile2/volatile_tuple_element.test.cpp
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@@ -0,0 +1,9 @@
// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#include <tuple>
#include <type_traits>

int main() {
static_assert(std::is_same_v<std::tuple_element_t<0, volatile std::tuple<int>>, volatile int>);
}
9 changes: 9 additions & 0 deletions tests/std/tests/P1831R1_cpp20_volatile3/const_volatile_tuple_element.test.cpp
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// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#include <tuple>
#include <type_traits>

int main() {
static_assert(std::is_same_v<std::tuple_element_t<0, const volatile std::tuple<int>>, const volatile int>);
}
4 changes: 4 additions & 0 deletions tests/std/tests/P1831R1_cpp20_volatile3/env.lst
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# Copyright (c) Microsoft Corporation.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

RUNALL_INCLUDE ..\usual_20_matrix.lst
4 changes: 4 additions & 0 deletions tests/std/tests/P1831R1_cpp20_volatile4/env.lst
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# Copyright (c) Microsoft Corporation.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

RUNALL_INCLUDE ..\usual_20_matrix.lst
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