August 4th, 2022

Breaking Changes:

• ⚠🎉 (all, smithy-rs#1570, @weihanglo) Support @deprecated trait for aggregate shapes
• ⚠ (all, smithy-rs#1157) Rename EventStreamInput to EventStreamSender
• ⚠ (all, smithy-rs#1157) The type of streaming unions that contain errors is generated without those errors.
  Errors in a streaming union Union are generated as members of the type UnionError.
  Taking Transcribe as an example, the AudioStream streaming union generates, in the client, both the AudioStream type:

  pub enum AudioStream {
      AudioEvent(crate::model::AudioEvent),
      Unknown,
  }

  and its error type,

  pub struct AudioStreamError {
      /// Kind of error that occurred.
      pub kind: AudioStreamErrorKind,
      /// Additional metadata about the error, including error code, message, and request ID.
      pub(crate) meta: aws_smithy_types::Error,
  }

  AudioStreamErrorKind contains all error variants for the union.
  Before, the generated code looked as:

  pub enum AudioStream {
      AudioEvent(crate::model::AudioEvent),
      ... all error variants,
      Unknown,
  }

• ⚠ (all, smithy-rs#1157) aws_smithy_http::event_stream::EventStreamSender and aws_smithy_http::event_stream::Receiver are now generic over <T, E>,
  where T is a streaming union and E the union's errors.
  This means that event stream errors are now sent as Err of the union's error type.
  With this example model:

  @streaming union Event {
      throttlingError: ThrottlingError
  }
  @error("client") structure ThrottlingError {}

  Before:

  stream! { yield Ok(Event::ThrottlingError ...) }

  After:

  stream! { yield Err(EventError::ThrottlingError ...) }

  An example from the SDK is in transcribe streaming.

New this release:

• 🎉 (all, smithy-rs#1482) Update codegen to generate support for flexible checksums.
• (all, smithy-rs#1520) Add explicit cast during JSON deserialization in case of custom Symbol providers.
• (all, smithy-rs#1578, @lkts) Change detailed logs in CredentialsProviderChain from info to debug
• (all, smithy-rs#1573, smithy-rs#1569) Non-streaming struct members are now marked #[doc(hidden)] since they will be removed in the future

Contributors
Thank you for your contributions! ❤

• @lkts (smithy-rs#1578)
• @weihanglo (smithy-rs#1570)