Data member with reference type is not const inside a const member function due to C++'s type system.
i.e
c.v is decorated from right to left thus
int& const data_member;
is not valid.
struct Fun {
int &a;
void run() const { a += 1; }
};
int main() {
int a = 42;
[&a] { a += 1; }();
Fun f{a};
f.run();
}
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