llvm-project/clang/test/SemaCXX/ms_mutable_reference_member...

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// RUN: %clang_cc1 %s -fsyntax-only -verify -fms-compatibility
struct S {
mutable int &a; // expected-warning {{'mutable' on a reference type is a Microsoft extension}}
S(int &b) : a(b) {}
};
int main() {
int a = 0;
const S s(a);
s.a = 10;
return s.a + a;
}