Access fields unmutably.

Let's say I have a struct:

struct Foo
{
    pub a : A,
    pub b : B,
}

and a function:
fn bar(a : &A, b : &mut B).

I want Foo.a to be immutable. However, if I were to make it private and write an immutable accessor, then I couldn't call:
bar(&foo.a, &mut foo.b)
anymore, since the accessor
fn get_a(&self) -> &A { &self.a }
would borrow the entire Foo on a call.

How do I work around this without creating a function which borrows every field (some mutable and some immutable, depending on which fields should remain unmutated)?

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