Add VS2026 to Drone

.drone.jsonnet

@@ -454,4 +454,10 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
         "cppalliance/dronevs2022:1",
         { TOOLSET: 'msvc-14.3', CXXSTD: '14,17,20,latest', ADDRMD: '32,64' },
     ),
+
+    windows_pipeline(
+        "Windows VS2026 msvc-14.5",
+        "cppalliance/dronevs2026:1",
+        { TOOLSET: 'msvc-14.5', CXXSTD: '14,17,20,latest', ADDRMD: '32,64' },
+    ),
 ]

include/boost/core/lightweight_test.hpp

@@ -207,6 +207,16 @@ inline std::string test_output_impl( char const& v )
     }
 }
 
+#if defined(__cpp_char8_t) && __cpp_char8_t >= 201811L
+
+inline std::string test_output_impl( char8_t const& v )
+{
+    // assume that char is ASCII, compatible with char8_t
+    return test_output_impl( static_cast<char>( v ) );
+}
+
+#endif
+
 // predicates
 
 struct lw_test_eq

test/lightweight_test_test6.cpp

@@ -1,6 +1,6 @@
 // Test BOOST_TEST_EQ with character types
 //
-// Copyright 2020 Peter Dimov
+// Copyright 2020, 2025 Peter Dimov
 // Distributed under the Boost Software License, Version 1.0.
 // https://www.boost.org/LICENSE_1_0.txt
 
@@ -19,14 +19,23 @@ int main()
 
 #if !defined(BOOST_NO_CXX11_CHAR16_T)
 
+    BOOST_TEST_EQ( u'A', u'A' );
     BOOST_TEST_EQ( (char16_t)1, (char16_t)1 );
 
 #endif
 
 #if !defined(BOOST_NO_CXX11_CHAR32_T)
 
+    BOOST_TEST_EQ( U'A', U'A' );
     BOOST_TEST_EQ( (char32_t)1, (char32_t)1 );
 
+#endif
+
+#if defined(__cpp_char8_t) && __cpp_char8_t >= 201811L
+
+    BOOST_TEST_EQ( u8'A', u8'A' );
+    BOOST_TEST_EQ( (char8_t)1, (char8_t)1 );
+
 #endif
 
     return boost::report_errors();