HardwireGen: Fix constructors

Author: CallumDev

src/WattleScript.HardwireGen.Test/MyWattleData.cs

@@ -6,13 +6,18 @@ namespace WattleScript.HardwireGen.Test;
 public class MyWattleData
 {
     public string Value = "";
-    public void SetString(string value)
-    {
-        Value = value;
-    }
 
     public int Add4(int a)
     {
         return a + 4;
     }
+
+    public MyWattleData()
+    {
+    }
+
+    public MyWattleData(string value)
+    {
+        Value = value;
+    }
 }

src/WattleScript.HardwireGen.Test/SanityTest.cs

@@ -12,6 +12,17 @@ public void Setup()
         LuaHardwire_WattleScript_HardwireGen_Test.Initialize();
     }
 
+    [Test]
+    public void Constructor()
+    {
+        var sc = new Script(CoreModules.None);
+        sc.Globals["MyWattleData"] = typeof(MyWattleData);
+        var r = sc.DoString("return MyWattleData.__new('Hello')");
+        Assert.IsInstanceOf<MyWattleData>(r.ToObject());
+        var wd = r.ToObject<MyWattleData>();
+        Assert.AreEqual("Hello", wd.Value);
+    }
+
     [Test]
     public void CallMethod()
     {

src/WattleScript.HardwireGen/HardwireSourceGenerator.cs

@@ -166,7 +166,11 @@ static HardwireType FromTypeSymbol(INamedTypeSymbol symbol)
                     if (method.MethodKind == MethodKind.Constructor)
                     {
                         if (!methods.ContainsKey("__new"))
-                            methods.Add("__new", new TypeMethod() { Constructor = true });
+                        {
+                            var ctor = new TypeMethod() { Constructor = true };
+                            ctor.SetName("__new");
+                            methods.Add("__new", ctor);
+                        }
                         methods["__new"].AddMethod(0, method);
                     }
                     else