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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++/79520
// { dg-do compile { target c++14 } }

constexpr int f(int const& x) { return x; }

constexpr struct S {
    int x = 0;
    constexpr S() {(void)f(x); x = 1;}
} s;

static_assert(f(s.x) == 1, "");