cargo install wasm-pack
wasm-pack build --target web
http-server -o
On Windows: cargo test passes.
`file!()` -> `path="src\\lib.rs" components=[Normal("src"), Normal("lib.rs")]`
On WASM that was built on Windows: cargo test would fail.
`file!()` -> `path="src\\lib.rs" components=[Normal("src\\lib.rs")]`