Merge pull request #421 from boostorg/unused_var

Fix unused variable warning

Author: mborland

.github/workflows/ci.yml

@@ -27,6 +27,7 @@ env:
   GIT_FETCH_JOBS: 8
   NET_RETRY_COUNT: 5
   DEFAULT_BUILD_VARIANT: release
+  ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: true
 
 jobs:
   posix:
@@ -252,10 +253,13 @@ jobs:
 
           - toolset: clang
             cxxstd: "11,14"
-            os: macos-11
+            os: macos-12
           - toolset: clang
             cxxstd: "20"
-            os: macos-12
+            os: macos-13
+          - toolset: clang
+            cxxstd: "20"
+            os: macos-14
 
     runs-on: ${{matrix.os}}
     container: ${{matrix.container}}

include/boost/test/utils/named_params.hpp

@@ -131,11 +131,11 @@ struct nil {
 #else
     operator T const&() const
 #endif
-    { nfp_detail::report_access_to_invalid_parameter(true); static T* v = 0; BOOST_TEST_UNREACHABLE_RETURN(*v); }
+    { nfp_detail::report_access_to_invalid_parameter(true); BOOST_TEST_UNREACHABLE_RETURN(*static_cast<T*>(0)); }
 
     template<typename T>
     T any_cast() const
-    { nfp_detail::report_access_to_invalid_parameter(true); static typename remove_reference<T>::type* v = 0; BOOST_TEST_UNREACHABLE_RETURN(*v); }
+    { nfp_detail::report_access_to_invalid_parameter(true); BOOST_TEST_UNREACHABLE_RETURN(*static_cast<typename std::remove_reference<T>::type*>(0)); }
 
     template<typename Arg1>
     nil operator()( Arg1 const& )