This implements a minimal wast testing harness in tests/wast.rs, which runs the wast tests under tests/wast. It also adds tests for trapping in a variety of ways, and fixes several bugs exposed by those tests.
This is the wasmtime-environ crate, which contains the implementations
of the ModuleEnvironment and FuncEnvironment traits from
cranelift-wasm. They effectively
implement an ABI for basic wasm compilation, which can be used for JITing,
native object files, or other purposes.