If you aren't expecting `VMExternRef`'s pointer-equality semantics, then these trait implementations can be foot guns. Instead of implementing the trait, make free functions in the `VMExternRef` namespace. This way, callers have to be a little more explicit.
This is the wasmtime-runtime crate, which contains wasm runtime library
support, supporting the wasm ABI used by wasmtime-environ,
wasmtime-jit, and wasmtime-obj.
This crate does not make a host vs. target distinction; it is meant to be compiled for the target.
Most users will want to use the main wasmtime crate instead of using this
crate directly.