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pub struct Vec { x: u32, y: u32, z: u32, }
pub extern "C" fn sum_c(a: &Vec, b: &Vec) -> Vec {
    return Vec {x: a.x + b.x, y: a.y + b.y, z: a.z + b.z };
}
pub fn sum_rust(a: &Vec, b: &Vec) -> Vec {
    return Vec {x: a.x + b.x, y: a.y + b.y, z: a.z + b.z };
}
Выхлоп:
example::sum_c:
        mov     eax, dword ptr [rsi]
        add     eax, dword ptr [rdi]
        mov     ecx, dword ptr [rsi + 4]
        add     ecx, dword ptr [rdi + 4]
        mov     edx, dword ptr [rsi + 8]
        add     edx, dword ptr [rdi + 8]
        shl     rcx, 32
        or      rax, rcx
        ret
example::sum_rust:
        mov     ecx, dword ptr [rdx]
        mov     r8d, dword ptr [rdx + 4]
        add     ecx, dword ptr [rsi]
        add     r8d, dword ptr [rsi + 4]
        mov     edx, dword ptr [rdx + 8]
        add     edx, dword ptr [rsi + 8]
        mov     rax, rdi
        mov     dword ptr [rdi], ecx
        mov     dword ptr [rdi + 4], r8d
        mov     dword ptr [rdi + 8], edx
        ret