[libcxx-commits] [libcxx] [libc++][array] Test `[[nodicard]]` with `array::const_iterator` (PR #202070)

[Hristo Hristov via libcxx-commits]

https://github.com/H-G-Hristov created https://github.com/llvm/llvm-project/pull/202070

Added tests with `array::const_iterator` for completeness.

Towards #172124

>From 23fb2d76cc72fa229a7a12de5e9cc6b0dce63af4 Mon Sep 17 00:00:00 2001
From: Hristo Hristov <hghristov.rmm at gmail.com>
Date: Sat, 6 Jun 2026 21:49:52 +0300
Subject: [PATCH] [libc++][array] Test `[[nodicard]]`  with
 `array::const_iterator`

Added tests with `array::const_iterator` for completeness.
---
 .../sequences/array/nodiscard.iterator.verify.cpp | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/libcxx/test/libcxx/containers/sequences/array/nodiscard.iterator.verify.cpp b/libcxx/test/libcxx/containers/sequences/array/nodiscard.iterator.verify.cpp
index a3ae77ae415f6..d2f4921a96ca2 100644
--- a/libcxx/test/libcxx/containers/sequences/array/nodiscard.iterator.verify.cpp
+++ b/libcxx/test/libcxx/containers/sequences/array/nodiscard.iterator.verify.cpp
@@ -17,23 +17,36 @@
 void test() {
   typedef std::array<int, 94> Container;
   Container c;
-  Container::iterator it = c.begin();
+  Container::iterator it        = c.begin();
+  Container::const_iterator cit = c.cbegin();
 
   // expected-warning-re at +1 {{{{(ignoring return value of function declared with 'nodiscard' attribute|expression result unused)}}}}
   *it;
+  // expected-warning-re at +1 {{{{(ignoring return value of function declared with 'nodiscard' attribute|expression result unused)}}}}
+  *cit;
 
   // expected-warning-re at +1 {{{{(ignoring return value of function declared with 'nodiscard' attribute|expression result unused)}}}}
   it[0];
+  // expected-warning-re at +1 {{{{(ignoring return value of function declared with 'nodiscard' attribute|expression result unused)}}}}
+  cit[0];
 
   // expected-warning-re at +1 {{{{(ignoring return value of function declared with 'nodiscard' attribute|expression result unused)}}}}
   it + 1;
+  // expected-warning-re at +1 {{{{(ignoring return value of function declared with 'nodiscard' attribute|expression result unused)}}}}
+  cit + 1;
 
   // expected-warning-re at +1 {{{{(ignoring return value of function declared with 'nodiscard' attribute|expression result unused)}}}}
   1 + it;
+  // expected-warning-re at +1 {{{{(ignoring return value of function declared with 'nodiscard' attribute|expression result unused)}}}}
+  1 + cit;
 
   // expected-warning-re at +1 {{{{(ignoring return value of function declared with 'nodiscard' attribute|expression result unused)}}}}
   it - 1;
+  // expected-warning-re at +1 {{{{(ignoring return value of function declared with 'nodiscard' attribute|expression result unused)}}}}
+  cit - 1;
 
   // expected-warning-re at +1 {{{{(ignoring return value of function declared with 'nodiscard' attribute|expression result unused)}}}}
   it - it;
+  // expected-warning-re at +1 {{{{(ignoring return value of function declared with 'nodiscard' attribute|expression result unused)}}}}
+  cit - cit;
 }