or [create one](https://github.com/rust-lang/libs-team/issues/new?assignees=&labels=api-change-proposal%2C+T-libs-api&template=api-change-proposal.md&title=%28My+API+Change+Proposal%29)
if you haven't already. If you're unsure where your change falls no worries,
just leave it as is and the reviewer will take a look and make a decision to
forward on if necessary.
Examples of `T-libs-api` changes:
* Stabilizing library features
* Introducing insta-stable changes such as new implementations of existing
stable traits on existing stable types
* Introducing new or changing existing unstable library APIs (excluding
permanently unstable features / features without a tracking issue)
* Changing public documentation in ways that create new stability guarantees
* Changing observable runtime behavior of library APIs