// RUN: %check_clang_tidy -std=c++20 %s modernize-use-constraints %t -- -- -fno-delayed-template-parsing

// NOLINTBEGIN
namespace std {
template <bool B, class T = void> struct enable_if { };

template <class T> struct enable_if<true, T> { typedef T type; };

template <bool B, class T = void>
using enable_if_t = typename enable_if<B, T>::type;

} // namespace std
// NOLINTEND

// Separate test file for the case where the first '>>' token part of
// an enable_if expression correctly handles the synthesized token.

template <typename T, typename = std::enable_if_t<T::some_value>>
void first_greatergreater_is_enable_if() {
}
// CHECK-MESSAGES: :[[@LINE-3]]:23: warning: use C++20 requires constraints instead of enable_if [modernize-use-constraints]
// CHECK-FIXES: {{^}}void first_greatergreater_is_enable_if() requires T::some_value {{{$}}