npm run-script build on an unchanged template fails

[anlumo]

Describe the Bug

I can't build a project created from this template for deployment (the dev server works fine).

Steps to Reproduce

1. Created new project with npx github:rustwasm/rust-webpack-template wasm-test-webpack
2. Built project with npm run-script build

Expected Behavior

A compiled project in dist.

Actual Behavior

> [email protected] build …\wasm-test-webpack
> rimraf dist pkg && webpack

🧐  Checking for wasm-pack...

✅  wasm-pack is installed. 

ℹ️  Compiling your crate in release mode...

[INFO]: Checking for the Wasm target...
[INFO]: Compiling to Wasm...
Compiling proc-macro2 v0.4.30
Compiling unicode-xid v0.1.0
Compiling cc v1.0.37
Compiling libc v0.2.58
Compiling syn v0.15.37
Compiling version_check v0.1.5
Compiling wasm-bindgen-shared v0.2.47
Compiling autocfg v0.1.4
Compiling memchr v2.2.0
Compiling failure_derive v0.1.5
Compiling cfg-if v0.1.9
Compiling lazy_static v1.3.0
Compiling bumpalo v2.4.3
Compiling rustc-demangle v0.1.15
Compiling unicode-segmentation v1.3.0
Compiling wasm-bindgen v0.2.47
Compiling sourcefile v0.1.4
Compiling backtrace v0.3.31
Compiling nom v4.2.3
Compiling log v0.4.6
Compiling heck v0.3.1
Compiling backtrace-sys v0.1.28
Compiling weedle v0.9.0
Compiling quote v0.6.12
Compiling synstructure v0.10.2
Compiling wasm-bindgen-backend v0.2.47
Compiling wasm-bindgen-macro-support v0.2.47
Compiling wasm-bindgen-macro v0.2.47
Compiling js-sys v0.3.24
Compiling console_error_panic_hook v0.1.6
Compiling failure v0.1.5
Compiling wasm-bindgen-webidl v0.2.47
Compiling web-sys v0.3.24
Compiling rust-webpack-template v0.1.0 (…\wasm-test-webpack)
    Finished release [optimized] target(s) in 1m 46s
[INFO]: Installing wasm-bindgen...
thread 'main' panicked at 'assertion failed: !self.dead.contains(&id)', C:\Program Files\Rust\.cargo\registry\src\github.com-1ecc6299db9ec823\walrus-0.8.0\src\tombstone_arena.rs:139:9
note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
Error: Running the wasm-bindgen CLI
Caused by: failed to execute `wasm-bindgen`: exited with exit code: 101
wasm-pack error: undefined
Hash: 634c67c8e1dd2cafc652
Version: webpack 4.35.0
Time: 108201ms
Built at: 2019-06-23 19:22:35
1 asset
Entrypoint index = index.js
[0] ./js/index.js 49 bytes {0} [built]

ERROR in ./js/index.js

Additional Context

I have an older instance of this template on a project of mine which works fine, so I don't think that it's my development environment.

[Pauan]

Please see rustwasm/wasm-bindgen#1613