Tables count error in Rust example (bad wasm?)

[jkriss]

When running the Rust example, I get the following error:

$ cargo run
   Compiling markdown v0.1.0 (/Users/jkriss/Desktop/wasmtime-demos/rust)
    Finished dev [unoptimized + debuginfo] target(s) in 4.26s
     Running `target/debug/markdown`
Error: tables count must be at most 1 (at offset 405)

This is after cloning the repo, installing Rust nightly and wasm-pack, then:

cd markdown
export WASM_INTERFACE_TYPES=1
wasm-pack build
cd ../rust
cp ../markdown/pkg/markdown.wasm .

In the python example, I get:

$ python3 run.py 
Traceback (most recent call last):
  File "run.py", line 7, in <module>
    import markdown
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "/usr/local/lib/python3.7/site-packages/wasmtime/__init__.py", line 46, in exec_module
    res = instantiate(data, imports)
Exception: Validation error: module did not validate

It seems that something's going wrong with the initial wasm generation. Any ideas? This is with 1.42.0-nightly and wasm-pack 0.8.1.

[alexcrichton]

Thanks for the report! For now you should be able to get examples working using 0.2.55 of wasm-bindgen. The 0.2.56 version and later emit a version of the interface types format that wasmtime doesn't support yet, but I'm working on it!

[peterhuene]

I think we should fix the markdown demo to be =0.2.55 until Wasmtime and the demos catch up to these changes.

[alexcrichton]

👍 Sounds like a good plan to me!

[alexcrichton]

I'm going to now that we've temporarily removed interface types support, but stay tuned to bytecodealliance/wasmtime#677 for future updates!