nested namespace not working in 0.2.63

[ctaggart]

Describe the Bug

I'm getting an error when trying to use #2105. cc @hajifkd.

^CCamerons-MacBook-Pro:monaco-hello-world cameron$ cargo build
    Blocking waiting for file lock on build directory
   Compiling monaco-hello-world v0.1.0 (/Users/cameron/rs/ts2rs/monaco-hello-world)
error: expected an identifier
  --> monaco-hello-world/src/lib.rs:17:58
   |
17 |         #[wasm_bindgen(module = "monaco", js_namespace = ["monaco", "editor"])]

I've got 0.2.63 of wasm-bindgen installed.

Camerons-MacBook-Pro:monaco-hello-world cameron$ cargo tree
monaco-hello-world v0.1.0 (/Users/cameron/rs/ts2rs/monaco-hello-world)
├── js-sys v0.3.40
│   └── wasm-bindgen v0.2.63
│       ├── cfg-if v0.1.10
│       └── wasm-bindgen-macro v0.2.63
│           ├── quote v1.0.6
│           │   └── proc-macro2 v1.0.17
│           │       └── unicode-xid v0.2.0
│           └── wasm-bindgen-macro-support v0.2.63
│               ├── proc-macro2 v1.0.17 (*)
│               ├── quote v1.0.6 (*)
│               ├── syn v1.0.27
│               │   ├── proc-macro2 v1.0.17 (*)
│               │   ├── quote v1.0.6 (*)
│               │   └── unicode-xid v0.2.0
│               ├── wasm-bindgen-backend v0.2.63
│               │   ├── bumpalo v3.3.0
│               │   ├── lazy_static v1.4.0
│               │   ├── log v0.4.8
│               │   │   └── cfg-if v0.1.10
│               │   ├── proc-macro2 v1.0.17 (*)
│               │   ├── quote v1.0.6 (*)
│               │   ├── syn v1.0.27 (*)
│               │   └── wasm-bindgen-shared v0.2.63
│               └── wasm-bindgen-shared v0.2.63
├── wasm-bindgen v0.2.63 (*)
└── web-sys v0.3.40
    ├── js-sys v0.3.40 (*)
    └── wasm-bindgen v0.2.63 (*)

Camerons-MacBook-Pro:monaco-hello-world cameron$ cargo --version
cargo 1.45.0-nightly (9fcb8c1d2 2020-05-25)

cargo install --list

wasm-bindgen-cli v0.2.63:
    wasm-bindgen
    wasm-bindgen-test-runner
    wasm2es6js
wasm-pack v0.9.1:
    wasm-pack

Steps to Reproduce

The bug can be reproduce on this line.

git clone [email protected]:taggartsoftware/ts2rs.git
git checkout monaco-hello-world

Uncomment the wasm-bindgen section in lib.rs, then cargo build.

[ctaggart]

Because it is not in 0.2.63. Really looking forward to 0.2.64!