wasm-pack prints wat syntax for a very long time

[Mipsters]

🐛 Bug description

wasm-pack build prints to console what I think is wat

🤔 Expected Behavior

build the project
not print wat code to console?

👟 Steps to reproduce

clone my repo https://github.com/Mipsters/html5ever-wasm
run wasm-pack build
wait for everything to compile
gits of result is linked at the bottom

🌍 Your environment

Include the relevant details of your environment.
wasm-pack version: 0.9.1
rustc version: rustc 1.48.0 (7eac88abb 2020-11-16)

using git bash, powershell or cmd didn't matter
it worked at some point, but then this happened

was actually using this version #908
and it worked pretty good for me except something weird that has nothing to do with this bug
and then this thing happened
and then I checked the regular version to see if it happened there too and it did

partial build log: https://gist.github.com/Mipsters/48511bc1926e3eaaaa5f132425834013

[Mipsters]

the problem probably lies in the test function
it also happens when it only contains

#[wasm_bindgen]
pub fn test() -> String {
    let out = Vec::new();
    return String::from_utf8(out).unwrap();
}

and I remove the square function

now it doesn't take too long to wait for, after all the wat code it says

Fatal: error in validating input
Error: failed to execute `wasm-opt`: exited with exit code: 1
  full command: "C:\\Users\\user\\AppData\\Local\\.wasm-pack\\wasm-opt-171374efd61df962\\wasm-opt.exe" "C:\\Users\\user\\Documents\\Projects\\Rust\\html5ever-wasm\\pkg\\html5ever_wasm_bg.wasm" "-o" "C:\\Users\\user\\Documents\\Projects\\Rust\\html5ever-wasm\\pkg\\html5ever_wasm_bg.wasm-opt.wasm" "-O"
To disable `wasm-opt`, add `wasm-opt = false` to your package metadata in your `Cargo.toml`

It may mean that I just wrote wrong Rust code? but I don't really know
sorry if that is the case
anyway, even if I did - I think the printing of wat code is not really helpful... maybe print an explanation before?

[juzi5201314]

hi, I think you seem to have encountered this bug: #886.
I have encountered it once and solved it based on this: #886 (comment)

[ashleygwilliams]

@Mipsters was @juzi5201314's suggestion able to address your issue? i'm going to close, but if you need more help please follow up