rust-overlay: can't compile wasm

[P-E-Meunier]

It seems people can compile to wasm fine on many platforms, but this overlay seems to install an outdated version of some component of the toolchain, which produces unusable wasm.

[nbp]

Have you added wasm as a target?
https://github.com/mozilla/nixpkgs-mozilla/blob/master/rust-overlay.nix#L142

[P-E-Meunier]

Yes, obviously. If you can compile the examples in wasm-bindgen, could you please share a nix expression that achieves it?

[P-E-Meunier]

Post-RustFest update: after comparing the wasm produced by a non-NixOS machine, this is likely due to a link problem.