Contain code that will be rejected by future version of Rust

[erwanvivien]

I get

warning: the following packages contain code that will be rejected by a future version of Rust: console_log v0.2.0

When compiling my project https://github.com/erwanvivien/gifski on branch wasm32 using

RUSTFLAGS="-C target-feature=+atomics,+bulk-memory,+mutable-globals" cargo build --target=wasm32-unknown-unknown --release -Z build-std=panic_abort,std

I don't know if it's normal?

[iamcodemaker]

🤔 I'll need to look into that.

[iamcodemaker]

I don't see this warning when building locally with cargo build --release. Additionally when running the command provided, I get an error indicating that the -Z flag is only supported on nightly. I'm not using nightly and don't have time to try and chase this down. If you (or anyone else) want's to take a crack at figuring out what's causing this, pull requests are welcome. Having said that, it does not seem like a serious issue and should be safe to ignore.

[erwanvivien]

You were right, I found the log and it's very simple bug:

$ cargo report future-incompatibilities --id 1
The following warnings were discovered during the build. These warnings are an
indication that the packages contain code that will become an error in a
future release of Rust. These warnings typically cover changes to close
soundness problems, unintended or undocumented behavior, or critical problems
that cannot be fixed in a backwards-compatible fashion, and are not expected
to be in wide use.

Each warning should contain a link for more information on what the warning
means and how to resolve it.


To solve this problem, you can try the following approaches:


- If the issue is not solved by updating the dependencies, a fix has to be
implemented by those dependencies. You can help with that by notifying the
maintainers of this problem (e.g. by creating a bug report) or by proposing a
fix to the maintainers (e.g. by creating a pull request):

  - console_log@0.2.1
  - Repository: https://github.com/iamcodemaker/console_log
  - Detailed warning command: `cargo report future-incompatibilities --id 1 --package console_log@0.2.1`

- If waiting for an upstream fix is not an option, you can use the `[patch]`
section in `Cargo.toml` to use your own version of the dependency. For more
information, see:
https://doc.rust-lang.org/cargo/reference/overriding-dependencies.html#the-patch-section
        
The package `console_log v0.2.1` currently triggers the following future incompatibility lints:
> warning: trailing semicolon in macro used in expression position
>   --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/console_log-0.2.1/src/style.rs:19:83
>    |
> 19 |                 concat!("color: white; padding: 0 3px; background: ", $color, ";");
>    |                                                                                   ^
> ...
> 24 |             trace: bg_color!("gray"),
>    |                    ----------------- in this macro invocation
>    |
>    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
>    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
>    = note: `#[allow(semicolon_in_expressions_from_macros)]` on by default
>    = note: this warning originates in the macro `bg_color` (in Nightly builds, run with -Z macro-backtrace for more info)
> 
> warning: trailing semicolon in macro used in expression position
>   --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/console_log-0.2.1/src/style.rs:19:83
>    |
> 19 |                 concat!("color: white; padding: 0 3px; background: ", $color, ";");
>    |                                                                                   ^
> ...
> 25 |             debug: bg_color!("blue"),
>    |                    ----------------- in this macro invocation
>    |
>    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
>    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
>    = note: `#[allow(semicolon_in_expressions_from_macros)]` on by default
>    = note: this warning originates in the macro `bg_color` (in Nightly builds, run with -Z macro-backtrace for more info)
> 
> warning: trailing semicolon in macro used in expression position
>   --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/console_log-0.2.1/src/style.rs:19:83
>    |
> 19 |                 concat!("color: white; padding: 0 3px; background: ", $color, ";");
>    |                                                                                   ^
> ...
> 26 |             info: bg_color!("green"),
>    |                   ------------------ in this macro invocation
>    |
>    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
>    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
>    = note: `#[allow(semicolon_in_expressions_from_macros)]` on by default
>    = note: this warning originates in the macro `bg_color` (in Nightly builds, run with -Z macro-backtrace for more info)
> 
> warning: trailing semicolon in macro used in expression position
>   --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/console_log-0.2.1/src/style.rs:19:83
>    |
> 19 |                 concat!("color: white; padding: 0 3px; background: ", $color, ";");
>    |                                                                                   ^
> ...
> 27 |             warn: bg_color!("orange"),
>    |                   ------------------- in this macro invocation
>    |
>    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
>    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
>    = note: `#[allow(semicolon_in_expressions_from_macros)]` on by default
>    = note: this warning originates in the macro `bg_color` (in Nightly builds, run with -Z macro-backtrace for more info)
> 
> warning: trailing semicolon in macro used in expression position
>   --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/console_log-0.2.1/src/style.rs:19:83
>    |
> 19 |                 concat!("color: white; padding: 0 3px; background: ", $color, ";");
>    |                                                                                   ^
> ...
> 28 |             error: bg_color!("darkred"),
>    |                    -------------------- in this macro invocation
>    |
>    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
>    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
>    = note: `#[allow(semicolon_in_expressions_from_macros)]` on by default
>    = note: this warning originates in the macro `bg_color` (in Nightly builds, run with -Z macro-backtrace for more info)
>