* Preserve full native stack traces in errors This commit builds on #759 by performing a few refactorings: * The `backtrace` crate is updated to 0.3.42 which incorporates the Windows-specific stack-walking code, so that's no longer needed. * A full `backtrace::Backtrace` type is held in a trap at all times. * The trap structures in the `wasmtime-*` internal crates were refactored a bit to preserve more information and deal with raw values rather than converting between various types and strings. * The `wasmtime::Trap` type has been updated with these various changes. Eventually I think we'll want to likely render full stack traces (and/or partial wasm ones) into error messages, but for now that's left as-is and we can always improve it later. I suspect the most relevant thing we need to do is to implement function name symbolication for wasm functions first, and then afterwards we can incorporate native function names! * Fix some test suite assertions
Wasmtime Embedding API
The wasmtime crate is an embedding API of the wasmtime WebAssembly runtime.
This is intended to be used in Rust projects and provides a high-level API of
working with WebAssembly modules.
If you're interested in embedding wasmtime in other languages, you may wish to
take a look a the C embedding API instead!