Update single_include/inja.hpp

Author: Stat1cV01D

include/inja/environment.hpp

@@ -31,10 +31,9 @@ class Environment {
     using BasicArg = std::remove_const_t<
         std::remove_pointer_t<std::remove_reference_t<std::decay_t<Arg>>>>;
 
-    constexpr bool is_valid_arg =
-        std::is_const_v<std::remove_reference_t<Arg>> ||
+    constexpr bool check = std::is_const_v<std::remove_reference_t<Arg>> ||
         std::is_same_v<BasicArg, Arg>;
-    static_assert(is_valid_arg, "Arguments should be either const& or a value type");
+    static_assert(check, "Arguments should be either const& or a value type");
 
     if constexpr (std::is_same_v<BasicArg, json>) {
       return *args[index];