Using wast in combination with wasm-encoder

[LHolten]

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<wast::Instruction> for wasm_encoder::Instruction.

[alexcrichton]

Thanks for the report! The eventual goal is to have wast depend on wasm-encoder, and at that point we could have conversion from the wast AST to types in the wasm-encoder trait, such as wast::Expression returning a Vec<wasm_encoder::Instruction> or similar. At this time though that's not yet implemented, but if you're interested to help out I think it'd be great to implement!