Wasm-bindgen: Compilation of the example fails

[expobrain]

I'm trying to compile the example at https://rustwasm.github.io/wasm-bindgen/whirlwind-tour/basic-usage.html but the compilation fails:

$ cargo +nightly build --target wasm32-unknown-unknown
   Compiling wasm-bindgen v0.2.23
error[E0463]: can't find crate for `core`
  |
  = note: the `wasm32-unknown-unknown` target may not be installed

error: aborting due to previous error

For more information about this error, try `rustc --explain E0463`.
error: Could not compile `wasm-bindgen`.

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

Let me know if you need more informations.

[alexcrichton]

Thanks for the report! It looks like the wasm target isn't added for your toolchain, and I think this should fix the issue:

$ rustup target add wasm32-unknown-unknown --toolchain nightly

[Itanq]

Hi @alexcrichton I have the same Issue, and I already run following command:
rustup target add wasm32-unknown-unknown --toolchain nightly
and the command's result as following:
info: component 'rust-std' for target 'wasm32-unknown-unknown' is up to date
but still occurrus the issue：
error[E0463]: can't find crate forcore | = note: thewasm32-unknown-unknowntarget may not be installed error: aborting due to previous error

[alexcrichton]

@Itanq oh it looks like you added the wasm target to the nightly toolchain, so you'll need to make sure any build commands are prefixed with rustup run nightly ...

[steelx]

ADD this once: rustup target add wasm32-unknown-unknown --toolchain nightly
SOLUTION :
rustup run nightly cargo build --target wasm32-unknown-unknown