expression has type externref but expected i32

[domoritz]

Describe the Bug

When I compile my project with --reference-types, I get expression has type externref but expected i32 in Firefox (nightly 87.0a1 (2021-02-04) as well as beta) and Chrome (with flags to enable reference types).

Steps to Reproduce

1. Clone https://github.com/domoritz/arrow-wasm/tree/bc8cc58b0cdedf4754a190de62b6d5a088ac40b5
2. Install wasm bindgen cli
3. Run yarn build
4. Start python web server
5. Go to http://localhost:8000/examples/index_web.html (ideally in FF so you don't need extra flags to enable reference types)
6. See error

Expected Behavior

Without --reference-types the library works so I would expect it to work with the flag as well.

Actual Behavior

Error expression has type externref but expected i32.

[alexcrichton]

Would you be able to upload the wasm file? Additionally could you clarify which wasm-bindgen-cli version you're using?

[domoritz]

Thanks for looking into my issue. wasm-bindgen v0.2.70 (via wasm-bindgen --version). I uploaded the lockfile and wasm files to https://github.com/domoritz/arrow-wasm/tree/dom/reference-types (wasm file is at https://github.com/domoritz/arrow-wasm/blob/dom/reference-types/pkg/arrow_wasm_bg.wasm).

[alexcrichton]

Was this file perhaps run through wasm-opt? If you disable that does it work for you?

[domoritz]

I don't think so. This is my build script.

[alexcrichton]

Ok thanks for clarifying! I dug in a bit and this should be fixed in #2450. Thanks again for the report!

[domoritz]

Awesome. I'm glad I could help. Thank you for the fix (and all your work on the Rust wasm ecosystem)!