[capnproto] How to reference constant value from one in another?

[vlovich]

I was wondering if it's possible to derive one constant from another?

Something like:

struct Foo {
  a @0 :Float32;
  b @1 :Float32;
};

const oneWay :Foo = ( a = 1.0, b = 2.0 )
const orAnother :Foo = ( a = .oneWay.b, b = .oneWay.a )

And of course expanding this wondering if basic math operations like 
negation or even addition/subtraction are supported in these references?

Thanks,
Vitali

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