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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
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// DR 1813
// PR c++/83374 - __is_standard_layout wrong for a class with repeated bases.
// { dg-do compile { target c++11 } }

struct R { };
struct Q { };
struct S : R { };
struct T : Q { };
struct U : S, T { };
// No repeated base class subobjects.
static_assert(__is_standard_layout(U), "");