Fix clang 21 warnings

error: function 'operator()' could be declared with attribute 'noreturn'
[-Werror,-Wmissing-noreturn]

Author: a666

src/item_search.cpp

@@ -37,7 +37,7 @@ static std::function< bool( const item & )> can_contain_filter( std::string_view
         std::string_view filter, Unit max, std::vector<std::pair<std::string, Unit>> units,
         std::function<item( itype *, Unit u )> set_function )
 {
-    auto const error = [hint, filter]( char const *, size_t /* offset */ ) {
+    auto const error = [hint, filter]( char const *, size_t /* offset */ ) __attribute__((noreturn)) {
         throw math::runtime_error( _( string_format( hint, filter ) ) );
     };
     // Start at max. On convert failure: results are empty and user knows it is unusable.

src/math_parser.cpp

@@ -838,7 +838,7 @@ void math_exp::math_exp_impl::new_func()
             {
                 output.emplace( std::in_place_type_t<func_jmath>(), std::move( params ), v );
             },
-            []( auto /* v */ )
+            []( auto /* v */ ) __attribute__((noreturn))
             {
                 throw math::internal_error( "Internal func error.  That's all we know." );
             },
@@ -975,7 +975,7 @@ void math_exp::math_exp_impl::new_oper()
             type = math_type_t::assign;
             output.emplace( std::in_place_type_t<ass_oper>(), lhs, mhs, rhs, v->f );
         },
-        []( auto /* v */ )
+        []( auto /* v */ ) __attribute__((noreturn))
         {
             // we should never get here due to paren validation
             throw math::internal_error( "Internal oper error.  That's all we know." );

src/math_parser_diag.cpp

@@ -101,7 +101,7 @@ constexpr std::string_view _str_type_of()
 template <typename T>
 T _read_from_string( std::string_view s, const std::vector<std::pair<std::string, T>> &units )
 {
-    auto const error = [s]( char const * suffix, size_t /* offset */ ) {
+    auto const error = [s]( char const * suffix, size_t /* offset */ ) __attribute__((noreturn)) {
         throw math::runtime_error( R"(Failed to convert "%s" to a %s value: %s)", s,
                                    _str_type_of<T>(), suffix );
     };

src/recipe_dictionary.cpp

@@ -215,7 +215,7 @@ template<typename Unit>
 static Unit can_contain_filter( std::string_view hint, std::string_view txt, Unit max,
                                 std::vector<std::pair<std::string, Unit>> units )
 {
-    auto const error = [hint, txt]( char const *, size_t /* offset */ ) {
+    auto const error = [hint, txt]( char const *, size_t /* offset */ ) __attribute__((noreturn)) {
         throw math::runtime_error( _( string_format( hint, txt ) ) );
     };
     // Start at max. On convert failure: results are empty and user knows it is unusable.