diff --git a/src/Peachpie.Library.Scripting/Context.Script.cs b/src/Peachpie.Library.Scripting/Context.Script.cs
index 8b103c7bbf..7ff59c7df3 100644
--- a/src/Peachpie.Library.Scripting/Context.Script.cs
+++ b/src/Peachpie.Library.Scripting/Context.Script.cs
@@ -15,11 +15,23 @@
 
 namespace Peachpie.Library.Scripting
 {
+    /// <summary>
+    /// Represents a script created by <see cref="ScriptingProvider"/>.
+    /// </summary>
+    [PhpHidden]
+    public interface IScript : Context.IScript
+    {
+        /// <summary>
+        /// Assembly byte content.
+        /// </summary>
+        ImmutableArray<byte> Image { get; }
+    }
+
     /// <summary>
     /// Script representing a compiled submission.
     /// </summary>
     [DebuggerDisplay("Script ({AssemblyName.Name})")]
-    sealed class Script : Context.IScript
+    sealed class Script : IScript
     {
         #region Fields & Properties
 
diff --git a/src/Peachpie.Runtime/Attributes.cs b/src/Peachpie.Runtime/Attributes.cs
index b0f86b133a..179afbe6f0 100644
--- a/src/Peachpie.Runtime/Attributes.cs
+++ b/src/Peachpie.Runtime/Attributes.cs
@@ -171,7 +171,7 @@ public TargetPhpLanguageAttribute(string langVersion, bool shortOpenTag)
     /// <summary>
     /// Marks public declarations that won't be visible in the PHP context.
     /// </summary>
-    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Enum | AttributeTargets.Method | AttributeTargets.Field | AttributeTargets.Property)]
+    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Interface | AttributeTargets.Enum | AttributeTargets.Method | AttributeTargets.Field | AttributeTargets.Property)]
     public sealed class PhpHiddenAttribute : Attribute
     {
     }
diff --git a/src/Tests/Peachpie.App.Tests/CompiledILTest.cs b/src/Tests/Peachpie.App.Tests/CompiledILTest.cs
new file mode 100644
index 0000000000..91c5775fb4
--- /dev/null
+++ b/src/Tests/Peachpie.App.Tests/CompiledILTest.cs
@@ -0,0 +1,90 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Pchp.Core;
+using ICSharpCode.Decompiler;
+using ICSharpCode.Decompiler.CSharp;
+using ICSharpCode.Decompiler.TypeSystem;
+using ICSharpCode.Decompiler.Metadata;
+using Peachpie.Library.Scripting;
+using System.Reflection.PortableExecutable;
+using System.Reflection.Metadata;
+using ICSharpCode.Decompiler.CSharp.Syntax;
+
+
+namespace Peachpie.App.Tests
+{
+    [TestClass]
+    public class CompiledILTest
+    {
+        static IScript Compile(string code)
+        {
+            using (var ctx = Context.CreateConsole(string.Empty))
+            {
+                return (IScript)Context.DefaultScriptingProvider.CreateScript(new Context.ScriptOptions()
+                {
+                    Context = ctx,
+                    Location = new Location(Path.Combine(Directory.GetCurrentDirectory(), "fake.php"), 0, 0),
+                    EmitDebugInformation = true,
+                    IsSubmission = false,
+                    AdditionalReferences = new string[] {
+                        typeof(CompiledILTest).Assembly.Location,
+                    },
+                }, code);
+            }
+        }
+
+        static CSharpDecompiler Decompile(IScript script)
+        {
+            var fileName = "fake.dll";
+            var file = new PEFile(fileName, new PEReader(script.Image));
+
+            var resolver = new UniversalAssemblyResolver(
+                fileName,
+                false,
+                file.DetectTargetFrameworkId(),
+                file.DetectRuntimePack(),
+                PEStreamOptions.PrefetchMetadata,
+                MetadataReaderOptions.None
+            );
+
+            return new CSharpDecompiler(new DecompilerTypeSystem(file, resolver), new DecompilerSettings() { });
+        }
+
+        static bool DecompileFunction(IScript script, string fnname, out IMethod method, out AstNode ast)
+        {
+            var minfo = script.GetGlobalRoutineHandle(fnname).Single();
+
+            var decompiler = Decompile(script);
+            var mainType = decompiler.TypeSystem.FindType(new FullTypeName(minfo.DeclaringType.FullName)).GetDefinition();
+            
+            method = mainType.Methods.Single(m => m.Name == minfo.Name);
+            ast = decompiler.Decompile(method.MetadataToken).LastChild;
+
+            return true;
+        }
+
+        [TestMethod]
+        public void TestSimpleFunction()
+        {
+            var script = Compile(@"<?php
+
+function test() { return 1; }
+");
+            var testAst = DecompileFunction(script, "test", out var method, out var ast);
+
+            Assert.IsTrue(method.ReturnType.FullName == typeof(long).FullName);
+
+            var bodyCode = ast.LastChild.ToString().Trim();
+
+            Assert.IsTrue(
+                // method body
+                "{\r\n\treturn 1L;\r\n}" == bodyCode
+            );
+        }
+    }
+}
diff --git a/src/Tests/Peachpie.App.Tests/Peachpie.App.Tests.csproj b/src/Tests/Peachpie.App.Tests/Peachpie.App.Tests.csproj
index 009406dbbd..fb1890be5b 100644
--- a/src/Tests/Peachpie.App.Tests/Peachpie.App.Tests.csproj
+++ b/src/Tests/Peachpie.App.Tests/Peachpie.App.Tests.csproj
@@ -5,6 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="ICSharpCode.Decompiler" Version="8.2.0.7535" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.3.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="2.0.0" />
     <PackageReference Include="MSTest.TestFramework" Version="2.0.0" />