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This is currently a very common operation in host bindings where if wasm gives a host function a relative pointer you'll want to simulataneously work with the host state and the wasm memory. These two regions are distinct and safe to borrow mutably simulataneously but it's not obvious in the Rust type system that this is so, so add a helper method here to assist in doing so.
wiggle
Wiggle is a code generator for the host side of a witx interface. It is
invoked as a Rust procedural macro.
Wiggle is not specialized to any particular WebAssembly runtime. It is usable in at least Wasmtime and Lucet.
Learning more
Read the docs on docs.rs.
There are child crates for integrating with Wasmtime and Lucet.
The wasi-common crate is implemented using Wiggle and the wasmtime-wasi crate integrates wasi-common with the Wasmtime engine.
Andrew Brown wrote a great blog post on using Wiggle with Wasmtime.