diff --git a/compiler/Compiler/Generator.cs b/compiler/Compiler/Generator.cs
index 6fe4cf3..d869002 100644
--- a/compiler/Compiler/Generator.cs
+++ b/compiler/Compiler/Generator.cs
@@ -14,6 +14,12 @@ public sealed class Generator(List<NodeDefinition> nodes)
     private string Emit()
     {
         writer.WriteLine("""
+                         #include <float.h>
+                         #include <stdarg.h>
+                         #include <stddef.h>
+                         #include <stdbool.h>
+                         #include <stdint.h>
+
                          struct string {
                             const char *data;
                             int length;
@@ -59,6 +65,8 @@ public sealed class Generator(List<NodeDefinition> nodes)
             case NodeStatementReturn statement:
                 EmitStatementReturn(statement);
                 break;
+            default:
+                throw new ArgumentOutOfRangeException(nameof(node), node, null);
         }
     }
 
@@ -91,155 +99,88 @@ public sealed class Generator(List<NodeDefinition> nodes)
     {
         return node switch
         {
-            NodeExpressionBoolLiteral expression => EmitExpressionBoolLiteral(expression),
-            NodeExpressionIntLiteral expression => EmitExpressionIntLiteral(expression),
-            NodeExpressionStringLiteral expression => EmitExpressionStringLiteral(expression),
-            NodeExpressionIdent expression => EmitExpressionIdent(expression),
+            NodeExpressionBoolLiteral expression => expression.Value.Value ? "true" : "false",
+            NodeExpressionIntLiteral expression => expression.Value.Value.ToString(),
+            NodeExpressionStringLiteral expression => $"(struct string){{ \"{expression.Value.Value}\", {expression.Value.Value.Length} }}",
+            NodeExpressionIdent expression => expression.Value.Ident,
+            _ => throw new ArgumentOutOfRangeException(nameof(node), node, null)
         };
     }
 
-    private string EmitExpressionBoolLiteral(NodeExpressionBoolLiteral expression)
+    private static string CType(NodeType node, string? varName = null)
     {
-        return expression.Value.Value ? "1" : "0";
-    }
-
-    private string EmitExpressionIntLiteral(NodeExpressionIntLiteral expression)
-    {
-        return expression.Value.Value.ToString();
-    }
-
-    private string EmitExpressionStringLiteral(NodeExpressionStringLiteral expression)
-    {
-        return $"(struct string){{ \"{expression.Value.Value}\", {expression.Value.Value.Length} }}";
-    }
-
-    private string EmitExpressionIdent(NodeExpressionIdent expression)
-    {
-        return expression.Value.Ident;
-    }
-
-    private static string CType(NodeType type, string? variableName = null)
-    {
-        return type switch
+        return node switch
         {
-            NodeTypeVoid => "void" + (variableName != null ? $" {variableName}" : ""),
-            NodeTypeBool => "bool" + (variableName != null ? $" {variableName}" : ""),
-            NodeTypeSInt intType => CTypeSInt(intType, variableName),
-            NodeTypeUInt intType => CTypeUInt(intType, variableName),
-            NodeTypePointer ptr => CType(ptr.To) + "*" + (variableName != null ? $" {variableName}" : ""),
-            NodeTypeString => "struct string" + (variableName != null ? $" {variableName}" : ""),
-            NodeTypeFunc fn => CTypeFunc(fn, variableName),
+            NodeTypeVoid => "void" + (varName != null ? $" {varName}" : ""),
+            NodeTypeBool => "bool" + (varName != null ? $" {varName}" : ""),
+            NodeTypeCustom type => $"struct {type}" + (varName != null ? $" {varName}" : ""),
+            NodeTypeSInt type => $"int{type.Width}_t" + (varName != null ? $" {varName}" : ""),
+            NodeTypeUInt type => $"uint{type.Width}_t" + (varName != null ? $" {varName}" : ""),
+            NodeTypePointer type => CType(type.To) + (varName != null ? $" *{varName}" : "*"),
+            NodeTypeString => "struct string" + (varName != null ? $" {varName}" : ""),
+            NodeTypeFunc type => $"{CType(type.ReturnType)} (*{varName})({string.Join(", ", type.Parameters.Select(p => CType(p)))})",
+            _ => throw new ArgumentOutOfRangeException(nameof(node), node, null)
         };
     }
-
-    private static string CTypeSInt(NodeTypeSInt intType, string? varName)
-    {
-        var cType = intType.Width switch
-        {
-            8 => "char",
-            16 => "short",
-            32 => "int",
-            64 => "long long",
-        };
-
-        return cType + (varName != null ? $" {varName}" : "");
-    }
-
-    private static string CTypeUInt(NodeTypeUInt intType, string? varName)
-    {
-        var cType = intType.Width switch
-        {
-            8 => "unsigned char",
-            16 => "unsigned short",
-            32 => "unsigned int",
-            64 => "unsigned long long",
-        };
-
-        return cType + (varName != null ? $" {varName}" : "");
-    }
-
-    private static string CTypeFunc(NodeTypeFunc fn, string? varName)
-    {
-        var returnType = CType(fn.ReturnType);
-        var parameters = string.Join(", ", fn.Parameters.Select(p => CType(p)));
-
-        if (string.IsNullOrEmpty(parameters))
-        {
-            parameters = "void";
-        }
-
-        if (varName != null)
-        {
-            return $"{returnType} (*{varName})({parameters})";
-        }
-
-        return $"{returnType} (*)({parameters})";
-    }
 }
 
 internal class IndentedTextWriter
 {
-    private readonly StringBuilder _builder = new();
-    private int _indentLevel;
+    private readonly StringBuilder builder = new();
+    private int indentLevel;
 
     public IDisposable Indent()
     {
-        _indentLevel++;
+        indentLevel++;
         return new IndentScope(this);
     }
 
     public void WriteLine(string text)
     {
         WriteIndent();
-        _builder.AppendLine(text);
+        builder.AppendLine(text);
     }
 
     public void Write(string text)
     {
         WriteIndent();
-        _builder.Append(text);
+        builder.Append(text);
     }
 
     public void WriteLine()
     {
-        _builder.AppendLine();
+        builder.AppendLine();
     }
 
     public override string ToString()
     {
-        return _builder.ToString();
+        return builder.ToString();
     }
 
     private void WriteIndent()
     {
-        if (_builder.Length > 0)
+        if (builder.Length > 0)
         {
-            var lastChar = _builder[^1];
+            var lastChar = builder[^1];
             if (lastChar != '\n' && lastChar != '\r')
                 return;
         }
 
-        for (var i = 0; i < _indentLevel; i++)
+        for (var i = 0; i < indentLevel; i++)
         {
-            _builder.Append("    ");
+            builder.Append("    ");
         }
     }
 
-    private class IndentScope : IDisposable
+    private class IndentScope(IndentedTextWriter writer) : IDisposable
     {
-        private readonly IndentedTextWriter _writer;
-        private bool _disposed;
-
-        public IndentScope(IndentedTextWriter writer)
-        {
-            _writer = writer;
-        }
+        private bool disposed;
 
         public void Dispose()
         {
-            if (_disposed) return;
-            _writer._indentLevel--;
-            _disposed = true;
+            if (disposed) return;
+            writer.indentLevel--;
+            disposed = true;
         }
     }
 }
\ No newline at end of file
diff --git a/compiler/Compiler/Program.cs b/compiler/Compiler/Program.cs
index 8c9cd6f..26bfc8d 100644
--- a/compiler/Compiler/Program.cs
+++ b/compiler/Compiler/Program.cs
@@ -6,7 +6,7 @@ const string contents = """
                             return 69
                         }
                         
-                        func do_something(text: string): func(i32 u32): void {
+                        func do_something(text: string): void {
                         }
                         """;