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% Traits
Traits are probably Rust's most complex feature, supporting a wide range of use
cases and design tradeoffs. Patterns of trait usage are still emerging.
### Know whether a trait will be used as an object. [FIXME: needs RFC]
Trait objects have some [significant limitations](objects.md): methods
invoked through a trait object cannot use generics, and cannot use
`Self` except in receiver position.
When designing a trait, decide early on whether the trait will be used
as an [object](objects.md) or as a [bound on generics](generics.md);
the tradeoffs are discussed in each of the linked sections.
If a trait is meant to be used as an object, its methods should take
and return trait objects rather than use generics.
### Default methods [FIXME]
> **[FIXME]** Guidelines for default methods.
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