Primitive traits and types representing basic properties of types.
Rust types can be classified in various useful ways according to their intrinsic properties. These classifications are represented as traits.
| PhantomData | Zero-sized type used to mark things that "act like" they own a |
| Copy | Types whose values can be duplicated simply by copying bits. |
| Send | Types that can be transferred across thread boundaries. |
| Sized | Types with a constant size known at compile time. |
| Sync | Types for which it is safe to share references between threads. |
| Unsize | [ Experimental ] Types that can be "unsized" to a dynamically-sized type. |
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https://doc.rust-lang.org/std/marker/index.html