Fix #120 - don't compile in JsValue in proc_macro.

[finnbear]

Fixes #120

If merged, will ultimately require cargo publish of new versions for all three crates.

[finnbear]

I incorrectly assumed that enabling a feature in the proc macro wouldn't also enable it in the main (stylist) crate. Will use a slightly different approach...

... done!

[futursolo]

I think this issue has got attention from the compiler team.
I recommend we see if they will prioritise as I do not think this particular regression should make into a release.

If they cannot fix it in a couple days then we can merge this mitigation.

In the meanwhile, would it be possible for you use a nightly version prior to this issue occurring?

[finnbear]

In the meanwhile, would it be possible for you use a nightly version prior to this issue occurring?

Don't worry about me! While I can't change nightly versions, I have pointed Cargo.toml at my github branch and am now up and running.

[futursolo]

I incorrectly assumed that enabling a feature in the proc macro wouldn't also enable it in the main (stylist) crate. Will use a slightly different approach...

... done!

With Rust 1.70, this regression has made into stable. So I think we should mitigate this.

Between the feature approach and target approach, I prefer the feature approach as this would allow others to write code with Error::Web without having to write #[cfg(...)] and this will disable language server / clippy for native targets.

I was actually able to build individual examples but not the workspace somehow.
Although cargo build for the entire workspace should also work as stylist uses cargo resolver 2.

Maybe we can have a mix of both approaches by applying the #[cfg(feature)] to type JsValue?

[finnbear]

I prefer the feature approach

I initially implemented a feature-based approach but it didn't work for reasons previously described - the feature appeared to be enabled when compiling stylist, not just when compiling the proc-macro crate.

It sounds like you may have a solution in mind, but I don't fully understand it, so feel free to fix this issue in whatever way you like in a different PR!

[universal-git]

This works, gets rid of the compile-error:
"/usr/bin/ld: __wbindgen_realloc: undefined version:
/usr/bin/ld: __wbindgen_malloc: undefined version:
/usr/bin/ld: __wbindgen_free: undefined version:
/usr/bin/ld: __wbindgen_exn_store: undefined version:
/usr/bin/ld: failed to set dynamic section sizes: bad value
collect2: error: ld returned 1 exit status
error: could not compile stylist-macros (lib) due to previous error"

Change is only in stylist-core/src/error.rs.
universal-git@a22aba4