gcc/testsuite/g++.dg/modules/cexpr-4_a.C

// { dg-additional-options "-fmodules-ts" }
export module Cexpr4;
// { dg-module-cmi "Cexpr4" }

struct A { int m = 42; };

constexpr A a;

export
inline int f() { return a.m; }