Rust std::time::Instant in C++
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`include/rust_time.h` contains `rust::time::Instant`, which is a port of Rust's `std::time::Instant` with memory-layout compatibility.
No guarantee for compatibility.
Since `std::time::Instant` and `std::time::Duration` is not `#[repr(C)]`, use it on your own risk. Data without `#[repr(C)]` is unbelievably fragile on FFI boundary.
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