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

[Max Gilmour]

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

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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 Released

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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