Public bug reported:

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.

** Affects: rust-defaults (Ubuntu)
     Importance: Medium
     Assignee: Zixing Liu (liushuyu-011)
         Status: New

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

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

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