with() statement doesn't want to work with property functions

[Andrej Mitrovic]

struct Bar { int x; }
struct Foo
{
    Bar _bar;
    Bar bar()
    {
        return _bar;
    }
}

void main()
{
    Foo foo;
    with (foo.bar)
    {
    }
}

Error: foo.bar() is not an lvalue

I've made a getter because I want to control how _bar is manipulated.
I've lost the ability to use the with statement, which is a minor
inconvenience. Is there a specific reason why with() should not be
allowed to be used with property functions?

This works fine:

immutable Foo foo;
with (foo)
{
}

So I don't see why it shouldn't work on property functions?