run wasm-pack build failed when use web-sys on windows

[huangjj27]

🐛 Bug description

import web-sys, and do nothing, then wasm-pack build complains:

Compilation of your program failed. stderr:

   Compiling web-sys v0.3.1
# file name, dir name or volume name syntax incorrect
error: couldn't read "\\\\?\\C:\\Users\\34937\\Desktop\\learning-rust\\wasm-pack-learn\\target\\wasm32-unknown-unknown\\release\\build\\web-sys-b58ff1058a8dc310\\out/bindings.rs": 文件名、目录名或卷标语法不正确。 (os error 123)    
  --> C:\Users\34937\.cargo\registry\src\mirrors.ustc.edu.cn-61ef6e0cd06fb9b8\web-sys-0.3.1\src\lib.rs:30:1
   |
30 | include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

error: Could not compile `web-sys`.

To learn more, run the command again with --verbose.

while the crate can be build just by running cargo build --target=wasm32-unknown-unknown.

🤔 Expected Behavior

It should build too with wasm-pack build

👟 Steps to reproduce

1. add edition & dependencies to Cargo.toml:

[package]
edition = "2018"

[dependencies]
web-sys = "0.3"

2. use web-sys in $MY_CRATE/src/lib.rs
3. run wasm-pack build. it would fail.

🌍 Your environment

Include the relevant details of your environment.
wasm-pack version: 0.5.0
rustc version: rustc 1.30.0-nightly (bb0896af1 2018-09-29)

[xmclark]

Thank you @huangjj27! I believe this may be related to #380.

[alexcrichton]

This may also have been a bug in wasm-bindgen which was since fixed and should now be published as web-sys 0.3.2, @huangjj27 mind trying out the latest version of web-sys to see if it's fixed?

[huangjj27]

@alexcrichton it fix! I cargo check and pass! thanks!