wasmer::EngineBuilder::engine returns a wasmer_compiler::Engine instead of wasmer::Engine

[dsherret]

I've been trying to upgrade wasmer, but have been unable to because 3.x is very slow dropping instances of modules. In order to do this fast, I apparently need to share an engine across all the instances (https://github.com/wasmerio/wasmer/pull/3378#issuecomment-1327679422).

I just tried out wasmer 3.3 and was unable to upgrade because wasmer::EngineBuilder::engine returns a wasmer_compiler::Engine instead of wasmer::Engine and is therefore incompatible with EngineRef. For example, the following code does not work:

let compiler = Cranelift::default();
let engine = EngineBuilder::new(compiler).engine();
let engineref = EngineRef::new(&engine);
//                             ^^^^^^^ expected struct `Engine`, found struct `wasmer_compiler::engine::inner::Engine`
let module = Module::new(&engineref, &wasm_bytes)?;

[dsherret]

I've discovered a way to do this is to do:

let engine: wasmer::Engine = engine.into();
let engine_ref = EngineRef::new(&engine);

That said, this is not very discoverable. I feel like .engine() in EngineBuilder should still return a wasmer::Engine?

[stale[bot]]

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