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# Objective The previous `PhantomData` instances were written somewhat lazily, so they were just things like `PhantomData<T>` for curves with an output type of `T`. This looks innocuous, but it unnecessarily constrains `Send/Sync` inference based on `T`. See [here](https://doc.rust-lang.org/nomicon/phantom-data.html#table-of-phantomdata-patterns). ## Solution Switch to `PhantomData` of the form `PhantomData<fn() -> T>` for most of these adaptors. Since they only have a functional relationship to `T` (i.e. it shows up in the return type of trait methods), this is more accurate. ## Testing Tested by compiling Bevy. Co-authored-by: François Mockers <mockersf@gmail.com> |
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Bevy Math
