[clang-format] incorrect formatting of type trait in assigment

[stmuench]

$ cat bug.cpp

#include <cstdint>
#include <type_traits>

namespace foo
{

enum class TypeKind : std::uint8_t
{
    KindA = 0,
    KindB
};

constexpr auto kTypeKind =
#ifdef TYPE_KIND_A
    TypeKind::KindA;
#else
    TypeKind::KindB;
#endif

namespace detail
{
constexpr auto kBpfMtu = 1512;
constexpr auto kIoSockMtu = 1518;

constexpr std::uint16_t kMTU = std::conditional<kTypeKind == TypeKind::KindA,
                                                std::integral_constant<std::uint16_t, kBpfMtu>,
                                                std::integral_constant<std::uint16_t, kIoSockMtu>>::type::value;
}  // namespace detail

}  // namespace foo

run: clang-format bug.cpp

expected would be something like:

constexpr std::uint16_t kMTU = std::conditional<kTypeKind == TypeKind::KindA,
                                                std::integral_constant<std::uint16_t, kBpfMtu>,
                                                std::integral_constant<std::uint16_t, kIoSockMtu>>::type::value;

actual formatting:

constexpr std::uint16_t kMTU = std::conditional < kTypeKind == TypeKind::KindA,
                        std::integral_constant<std::uint16_t, kBpfMtu>,
                        std::integral_constant < std::uint16_t,
                        kIoSockMtu >> ::type::value;

Worked fine with clang-format-18.
Occurs for clang-format-19 and 20.

[llvmbot]

@llvm/issue-subscribers-clang-format

Author: St. Muench (stmuench)

$ cat bug.cpp ``` #include <cstdint> #include <type_traits>

namespace foo
{

enum class TypeKind : std::uint8_t
{
KindA = 0,
KindB
};

constexpr auto kTypeKind =
#ifdef TYPE_KIND_A
TypeKind::KindA;
#else
TypeKind::KindB;
#endif

namespace detail
{
constexpr auto kBpfMtu = 1512;
constexpr auto kIoSockMtu = 1518;

constexpr std::uint16_t kMTU = std::conditional<kTypeKind == TypeKind::KindA,
std::integral_constant<std::uint16_t, kBpfMtu>,
std::integral_constant<std::uint16_t, kIoSockMtu>>::type::value;
} // namespace detail

} // namespace foo

run: `clang-format bug.cpp`

expected formatting:

constexpr std::uint16_t kMTU = std::conditional<kTypeKind == TypeKind::KindA,
std::integral_constant<std::uint16_t, kBpfMtu>,
std::integral_constant<std::uint16_t, kIoSockMtu>>::type::value;

actual formatting:

constexpr std::uint16_t kMTU = std::conditional < kTypeKind == TypeKind::KindA,
std::integral_constant<std::uint16_t, kBpfMtu>,
std::integral_constant < std::uint16_t,
kIoSockMtu >> ::type::value;

Worked fine with clang-format-15
</details>