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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
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// PR c++/78645
// { dg-do compile { target c++11 } }

typedef bool (*Function)(int);
constexpr bool check(int x, Function p) { return p(x); }  // { dg-message "in .constexpr. expansion of" }

static_assert(check(2, check), "");  // { dg-error "conversion|constant|in .constexpr. expansion of" }