[all-commits] [llvm/llvm-project] 18a4c9: [libc++] Fix bug where `optional<T&>` couldn't be ...

[William Tran-Viet via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 18a4c90c5191cb2bade557061ee4afa548468c1e
      https://github.com/llvm/llvm-project/commit/18a4c90c5191cb2bade557061ee4afa548468c1e
  Author: William Tran-Viet <wtranviet at proton.me>
  Date:   2026-06-13 (Sat, 13 Jun 2026)

  Changed paths:
    M libcxx/include/optional
    M libcxx/test/std/utilities/optional/optional.monadic/and_then.pass.cpp
    M libcxx/test/std/utilities/optional/optional.monadic/or_else.pass.cpp
    M libcxx/test/std/utilities/optional/optional.monadic/transform.pass.cpp

  Log Message:
  -----------
  [libc++] Fix bug where `optional<T&>` couldn't be constructed from `transform()` (#203462)

- Add the proper from monadic base constructor
- Fix the constraint so it allows references.
- Add tests



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