Allow undefined high order function

Developers
5

Thanks, I wasn’t aware of the 2nd thread. No surprise this has a bigger scope of package system. In that regard, perhaps we can do a better job than #include. I like the option suggested in the thread that we can do

import FooPackage // equal to #include <FooPackage.hpp>
functions{
matrix FooPackage::foo(func bar, vector x);
matrix FooPackage::bar(vector x);
}

as it gives us chance to allow

import FooPackage // equal to #include <FooPackage.hpp>
import BarPackage // when we have package system ready, BarPackage would be a Stan package.
functions{
matrix FooPackage::foo(func bar, vector x); // we may not even need to declare foo or bar.
matrix BarPackage::bar(vector x);
}

Then the syntax would be consistent.

For that to work, first we have to go extra mile beyond rstan, to add keyword import & :: in stanc3.

EDIT: related conversion Helpful function repository , in particular Helpful function repository - #7 by bbbales2

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