fix

sandbox/ConsoleApp2/ConsoleApp2.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net9.0</TargetFramework>
+        <LangVersion>13</LangVersion>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\..\src\Lua\Lua.csproj" />
+    </ItemGroup>
+
+</Project>

src/Lua/Standard/IOLibrary.cs

@@ -1,4 +1,3 @@
-using Lua.Internal;
 using Lua.Runtime;
 using Lua.Standard.Internal;
 

src/Lua/Standard/Internal/IOHelper.cs

@@ -1,6 +1,5 @@
 using System.Text;
 using Lua.Internal;
-using Lua.Runtime;
 
 namespace Lua.Standard.Internal;