diff --git a/compiler/Compiler/Parser.cs b/compiler/Compiler/Parser.cs
index 8c537ad..83870a9 100644
--- a/compiler/Compiler/Parser.cs
+++ b/compiler/Compiler/Parser.cs
@@ -4,23 +4,35 @@ namespace Compiler;
 
 public sealed class Parser(string fileName, List<Token> tokens)
 {
-    public static List<NodeDefinition> Parse(string fileName, List<Token> tokens, out List<Diagnostic> diagnostics)
+    public static Ast Parse(string fileName, List<Token> tokens, out List<Diagnostic> diagnostics)
     {
         return new Parser(fileName, tokens).Parse(out diagnostics);
     }
 
     private int index;
 
-    private List<NodeDefinition> Parse(out List<Diagnostic> diagnostics)
+    private Ast Parse(out List<Diagnostic> diagnostics)
     {
-        var nodes = new List<NodeDefinition>();
+        var functionDefinitions = new List<NodeDefinitionFunc>();
+        var structDefinitions = new List<NodeDefinitionStruct>();
         diagnostics = [];
 
         try
         {
             while (Peek() != null)
             {
-                nodes.Add(ParseDefinition());
+                var definition = ParseDefinition();
+                switch (definition)
+                {
+                    case NodeDefinitionFunc def:
+                        functionDefinitions.Add(def);
+                        break;
+                    case NodeDefinitionStruct def:
+                        structDefinitions.Add(def);
+                        break;
+                    default:
+                        throw new ArgumentOutOfRangeException(nameof(definition));
+                }
             }
         }
         catch (CompileException e)
@@ -28,7 +40,7 @@ public sealed class Parser(string fileName, List<Token> tokens)
             diagnostics.Add(e.Diagnostic);
         }
 
-        return nodes;
+        return new Ast(structDefinitions, functionDefinitions);
     }
 
     private NodeDefinition ParseDefinition()
@@ -504,6 +516,12 @@ public sealed class Parser(string fileName, List<Token> tokens)
     }
 }
 
+public sealed class Ast(List<NodeDefinitionStruct> structs, List<NodeDefinitionFunc> functions)
+{
+    public readonly List<NodeDefinitionStruct> Structs = structs;
+    public readonly List<NodeDefinitionFunc> Functions = functions;
+}
+
 public abstract class Node(List<Token> tokens)
 {
     public readonly List<Token> Tokens = tokens;
diff --git a/compiler/Compiler/Program.cs b/compiler/Compiler/Program.cs
index 794682f..8a4a407 100644
--- a/compiler/Compiler/Program.cs
+++ b/compiler/Compiler/Program.cs
@@ -16,7 +16,7 @@ if (tokenizerDiagnostics.Any(x => x.Severity == DiagnosticSeverity.Error))
     return 1;
 }
 
-var nodes = Parser.Parse(fileName, tokens, out var parserDiagnostics);
+var ast = Parser.Parse(fileName, tokens, out var parserDiagnostics);
 
 foreach (var diagnostic in parserDiagnostics)
 {
@@ -28,7 +28,7 @@ if (parserDiagnostics.Any(x => x.Severity == DiagnosticSeverity.Error))
     return 1;
 }
 
-var typedNodes = TypeChecker.Check(fileName, nodes, out var typeCheckerDiagnostics);
+var typedAst = TypeChecker.Check(fileName, ast, out var typeCheckerDiagnostics);
 
 foreach (var diagnostic in typeCheckerDiagnostics)
 {
@@ -40,7 +40,7 @@ if (typeCheckerDiagnostics.Any(x => x.Severity == DiagnosticSeverity.Error))
     return 1;
 }
 
-var output = Generator.Emit(typedNodes);
+var output = Generator.Emit(typedAst);
 
 File.WriteAllText("C:/Users/oliste/repos/nub-lang/compiler/Compiler/out.c", output);
 
diff --git a/compiler/Compiler/TypeChecker.cs b/compiler/Compiler/TypeChecker.cs
index 0408c65..ad565ff 100644
--- a/compiler/Compiler/TypeChecker.cs
+++ b/compiler/Compiler/TypeChecker.cs
@@ -1,10 +1,10 @@
 namespace Compiler;
 
-public sealed class TypeChecker(string fileName, List<NodeDefinition> definitions)
+public sealed class TypeChecker(string fileName, Ast ast)
 {
-    public static TypedAst Check(string fileName, List<NodeDefinition> nodes, out List<Diagnostic> diagnostics)
+    public static TypedAst Check(string fileName, Ast ast, out List<Diagnostic> diagnostics)
     {
-        return new TypeChecker(fileName, nodes).Check(out diagnostics);
+        return new TypeChecker(fileName, ast).Check(out diagnostics);
     }
 
     private Scope scope = new(null);
@@ -16,19 +16,19 @@ public sealed class TypeChecker(string fileName, List<NodeDefinition> definition
         diagnostics = [];
 
         // todo(nub31): Types must be resolved better to prevent circular dependencies and independent ordering
-        foreach (var structDef in definitions.OfType<NodeDefinitionStruct>())
+        foreach (var structDef in ast.Structs)
         {
             var fields = structDef.Fields.Select(x => new NubTypeStruct.Field(x.Name.Ident, CheckType(x.Type))).ToList();
             structTypes.Add(structDef.Name.Ident, new NubTypeStruct(fields));
         }
 
-        foreach (var funcDef in definitions.OfType<NodeDefinitionFunc>())
+        foreach (var funcDef in ast.Functions)
         {
             var type = new NubTypeFunc(funcDef.Parameters.Select(x => CheckType(x.Type)).ToList(), CheckType(funcDef.ReturnType));
             scope.DeclareIdentifier(funcDef.Name.Ident, type);
         }
 
-        foreach (var funcDef in definitions.OfType<NodeDefinitionFunc>())
+        foreach (var funcDef in ast.Functions)
         {
             try
             {
@@ -40,7 +40,7 @@ public sealed class TypeChecker(string fileName, List<NodeDefinition> definition
             }
         }
 
-        return new TypedAst(functions, structTypes.Values.ToList());
+        return new TypedAst(structTypes.Values.ToList(), functions);
     }
 
     private TypedNodeDefinitionFunc CheckDefinitionFunc(NodeDefinitionFunc definition)
@@ -363,10 +363,10 @@ public sealed class TypeChecker(string fileName, List<NodeDefinition> definition
     }
 }
 
-public sealed class TypedAst(List<TypedNodeDefinitionFunc> functions, List<NubTypeStruct> structTypes)
+public sealed class TypedAst(List<NubTypeStruct> structTypes, List<TypedNodeDefinitionFunc> functions)
 {
-    public List<TypedNodeDefinitionFunc> Functions = functions;
-    public List<NubTypeStruct> StructTypes = structTypes;
+    public readonly List<NubTypeStruct> StructTypes = structTypes;
+    public readonly List<TypedNodeDefinitionFunc> Functions = functions;
 }
 
 public abstract class TypedNode(List<Token> tokens)