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% Changes with unclear timing
### Associated items
* Many traits that currently take type parameters should instead use associated
types; this will _drastically_ simplify signatures in some cases.
* Associated constants would be useful in a few places, e.g. traits for
numerics, traits for paths.
### Anonymous, unboxed return types (aka `impl Trait` types)
* See https://github.com/rust-lang/rfcs/pull/105
* Could affect API design in several places, e.g. the `Iterator` trait.
### Default type parameters
We are already using this in a few places (e.g. `HashMap`), but it's
feature-gated.
### Compile-time function evaluation (CTFE)
https://github.com/mozilla/rust/issues/11621
### Improved constant folding
https://github.com/rust-lang/rust/issues/7834
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