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// DR 2428
// { dg-do compile { target c++20 } }
template<typename T>
concept C1 [[deprecated]] = true;
template<typename T>
concept C2 __attribute__((deprecated)) = false;
template<typename T>
concept C3 [[deprecated]] = true;
template<typename T>
concept C4 __attribute__((deprecated)) = false;
static_assert(C3<int>); // { dg-warning "'C3' is deprecated" }
static_assert(C4<int>); // { dg-error "static assertion failed" }
// { dg-warning "'C4' is deprecated" "" { target *-*-* } .-1 }
template<typename T>
requires C3<T> // { dg-warning "'C3' is deprecated" }
int fn1(T t) { return 0; }
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