Say I have a simple pair struct

pub struct Pair<First, Second> {
}

I want to be able to align it with, fn(size_of(First), size_of(Second)), where fn is min(16, bit_ceil(size_of(First) + size_of(Second))).

But repr(align()) seems to require a literal.

For more clarity, in C++, it would look something like:

struct alignas(get_alignment<First, Second>()) pair

where get_alignment is a const function

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