'Referencing function in another module` error when compiling for target wasm32-unknown-emscripten (debug mode)

[georgeroman]

I'm trying to compile a Rust project that depends on the byte-slice-cast crate, but I'm encountering a strange error. The same error pops up if having block-padding as a dependency. You can find all the details in this issue: sdroege/byte-slice-cast#13. As mentioned there, this only happens when compiling in debug mode, while release builds succeed.

Some info about the environment:
rustc 1.40.0 (73528e339 2019-12-16)
emcc (Emscripten gcc/clang-like replacement) 1.39.1 ((unknown revision))