Similar to message: 953 - Variable 'Symbol' (Location) could be declared as const

I would like to see a message for the following situation:

struct X
{
int i;
};

struct Y
{
const X& f();
};

int g( Y y)
{
const X x = y.f();
return x.i + 5;
}

In this case variable x could be declared as const ref.
When the intialization of a const variable is done with an other const variable or a function returning a const reference this message (or maybe two separete messages) could be issued