Impl trait initiative

initiative status: active

What is this?

This page tracks the work of the Impl trait initiative! To learn more about what we are trying to do, and to find out the people who are doing it, take a look at the charter.

Current status

This is an umbrella initiative and, as such, it covers a number of subprojects.

impl Trait in fns and inherent methods#123▰▰▰▰▰▰Stabilized
type alias impl trait#63063▰▰▰▰▱▱🦀Development
impl trait in traits, impls#123▰▰▱▱▱▱🦀Experimental
impl trait in bindings#63065▰▰▰▱▱▱💤Development
impl trait with multiple types▰▱▱▱▱▱💤Experimental
existential lifetimes▰▱▱▱▱▱💤Experimental


  • ✅ -- project complete
  • 🦀 -- project in progress
  • 💤 -- project not under active development

How Can I Get Involved?

  • Check for 'help wanted' issues on this repository!
  • If you would like to help with development, please contact the owner to find out if there are things that need doing.
  • If you would like to help with the design, check the list of active design questions first.
  • If you have questions about the design, you can file an issue, but be sure to check the FAQ or the design-questions first to see if there is already something that covers your topic.
  • If you are using the feature and would like to provide feedback about your experiences, please [open a "experience report" issue].
  • If you are using the feature and would like to report a bug, please open a regular issue.

We also participate on Zulip, feel free to introduce yourself over there and ask us any questions you have.

Building Documentation

This repository is also an mdbook project. You can view and build it using the following command.

mdbook serve