Synchronize the wit-bindgen type AST with the component model #318
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This PR updates wit-bindgen for the latest changes to the component model: - the return of multireturn - removal of the `unit` type - a new syntax for optional types in results, streams, futures and variants all of which go hand in hand. This also pulls in the latest versions of wasm-encoder, wasmprinter, and wasmparser crates to get their updates for these component model changes.
Exercise this throughout the runtime tests and additionally add a few variants in codegen tests to ensure that this is exercised.
peterhuene
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Sep 21, 2022
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Looks great! Thanks for updating wit-component as well.
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This PR, with @kulakowski-wasm, brings the wit-bindgen AST up-to-date with the component model. Namely the changes implemented here are:
Variantwith a non-optional payload type #220.unittype is removed, partially reverting Add new "unit" and "bool" primitive types #204.resulttype has itsokanderrvariants as now optional.This PR was mostly test-driven where the core changes were made to the AST and ABI code and everything else fell out from basically getting
cargo test --workspaceworking.This is additionally one of the first steps I hope to make towards #314 since if Wasmtime is to consume components the generator and Wasmtime need to agree on encodings which requires
wasm-encoderand such to be updated inwit-componentwhich requires these AST changes.