This crate is no longer used by smithy-rs and is deprecated. Its equivalent logic is now in aws-smithy-runtime-api and aws-smithy-runtime.
This crate is part of the [AWS SDK for Rust](https://awslabs.github.io/aws-sdk-rust/) and the [smithy-rs](https://github.com/smithy-lang/smithy-rs) code generator. In most cases, it should not be used directly.