[Bug 2072540] Re: rustc: "backchain" on IBM Z platforms is considered unsafe by Rust

[Zixing Liu]

This is now merged in the Rust upstream: https://github.com/rust-
lang/rust/commit/5e8e46cbd2f60693bd9b1f01a279faf62341a887

** Changed in: rust-defaults (Ubuntu)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/2072540

Title:
  rustc: "backchain" on IBM Z platforms is considered unsafe by Rust

Status in rust-defaults package in Ubuntu:
  Fix Committed

Bug description:
  The Rust compiler considers the "backchain" attribute unsafe on IBM Z
  (s390x) platforms.

  Upon investigation, this is because the feature allow list in the Rust
  compiler does not include this attribute.

  Since we want to enable backchain for all Rust projects in Ubuntu, we
  need to fix the Rust compiler so that this is not considered to be
  unsound.

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