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# Objective - Contributes to #15460 ## Solution - Wrap `derive_label` `quote!` in an anonymous constant which contains an `extern crate alloc` statement, allowing use of the `alloc` namespace even when a user has not brought in the crate themselves. ## Testing - CI passed locally. ## Notes We can't generate code that uses `::std::boxed::Box` in `no_std` environments, but we also can't rely on `::alloc::boxed::Box` either, since the user might not have declared `extern crate alloc`. To resolve this, the generated code is wrapped in an anonymous constant which contains the `extern crate alloc` invocation. This does mean the macro is no longer hygienic against cases where the user provides an alternate `alloc` crate, however I believe this is an acceptable compromise. Additionally, this crate itself doesn't need to be `no_std`, it just needs to _generate_ `no_std` compatible code. --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com> |
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Bevy Macro Utilities
