Using wast in combination with wasm-encoder

I'm trying to parse a WAT `Expression` and emit the instructions into a wasm-encoder `Function`.
This is for a language compiler i'm writing that has inlines WAT code.

The problem is that `wast::Instruction` is not compatible with `wasm_encoder::Instruction`.
Also the `wast::binary::Encode` trait is private, so i can't use that in combination with `wasm_encoder::Function::raw` either.

My suggestion is to either make the wast `Encode` trait public, or implement `From for wasm_encoder::Instruction`.