[llvm] [ADT] Remove ArrayRef(std::nullopt_t) (PR #165831)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-adt

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>

ArrayRef(std::nullopt_t) has been deprecated since:

  commit 2529de5c935ad59e5f76d15890f857bf42817bc9
  Author: Kazu Hirata <kazu@<!-- -->google.com>
  Date:   Fri Jun 27 01:03:02 2025 -0700

Note that we've made at lease one release, llvmorg-21.1, with this
deprecation.


---
Full diff: https://github.com/llvm/llvm-project/pull/165831.diff


1 Files Affected:

- (modified) llvm/include/llvm/ADT/ArrayRef.h (-4) 


``````````diff
diff --git a/llvm/include/llvm/ADT/ArrayRef.h b/llvm/include/llvm/ADT/ArrayRef.h
index 448d10013d371..450f4d04c97fc 100644
--- a/llvm/include/llvm/ADT/ArrayRef.h
+++ b/llvm/include/llvm/ADT/ArrayRef.h
@@ -66,10 +66,6 @@ namespace llvm {
     /// Construct an empty ArrayRef.
     /*implicit*/ ArrayRef() = default;
 
-    /// Construct an empty ArrayRef from std::nullopt.
-    /*implicit*/ LLVM_DEPRECATED("Use {} or ArrayRef<T>() instead", "{}")
-    ArrayRef(std::nullopt_t) {}
-
     /// Construct an ArrayRef from a single element.
     /*implicit*/ ArrayRef(const T &OneElt LLVM_LIFETIME_BOUND)
         : Data(&OneElt), Length(1) {}

``````````

</details>


https://github.com/llvm/llvm-project/pull/165831